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91 True/False questions

The primary factor skilled observatories are constructed on the greatest mountaintops is to → collect a big amount of light and lug it right into focus.

You are watching: The spitzer space telescope (sst) is stationed far from earth because

True False alleviate atmospheric blurring" type="hidden">

Both the Keck and VLT observatories are designed to permit interferometry to be used. T/F → True.Although the approach of interferomeattempt was pioneered using radio telescopes, it is now being extended to the infrared, and also probably eventually optical regions. See Section 5.6 in your textbook.

True False

As telescopes become larger and also larger, astronomers favor → True

True False Reflecting telescopes, in part because big lenses and also mirrors sag under their very own weight, and it is simpler to support a mirror alengthy its whole back side than it is to assistance a lens only approximately its edge" type="hidden">

Astronomers usage the term "seeing" to define which of the following? → The results of atmospheric turbulence

True False

What is supposed by the "diffractivity restricted resolution" of a telescope? → The finest possible angular resolution that deserve to be obtained by a telescope of a offered dimension if all other sources of blurring are eliminated

True False

The mirrors for X-ray telescopes are the very same form as those of optical reflectors. → False

True False

The Arecibo radio telescope is laid out choose which optical telescope design? → prime focus reflector

True False

Radio astronomy can just be done from up in area, as a result of our ionosphere. → True.Section 5.5 of the message and also the online image archive for Chapter 5 contain many photos reflecting such arrangements.

True False False" type="hidden">

The ideal way to research young stars surprise behind interstellar dust clouds would be to use → infrared light

True False

One system for enhancing telescopic imperiods entails collecting information from a component of the skies where tright here are no well-known sources of radiation. T/F → Earth is a warmth resource and also the telescope should be maintained exceptionally cool.

True False True. The information collected would certainly consist of background noise. This data can be supplied in computer processing of images taken with the telescope to improve the quality of the picture." type="hidden">

Optical telescopes are typically offered just at night, however radio telescopes have the right to be used day or night. → resolve finer detail

True False True" type="hidden">

Many type of observatories are inserted on optimal of mountains so they will certainly be closer to the objects they are observing. T/F → True.Yes. Although the Sun is a radio resource, it does not interfere unduly via daytime usage of radio telescopes.

True False False.An observatory on a tall mountain is over much of the environment. Atmospheric effects are a major factor why Earth-based telescopes cannot accomplish their diffraction-restricted resolution." type="hidden">

The Hubble Gap Telescope provides us its ideal resolution with X-rays. → False

True False

The main objective of any type of telescope is to create an enormously amplified picture of the area of watch. → False.Magnification is additional. Ala lot of all stars appear as only points of light via even the the majority of powerful telescopes. Light-gathering power and also reresolving power are the the majority of crucial properties of astronomical telescopes.

True False False" type="hidden">

The primary function of a telescope is to → collect a large amount of light and bring it into emphasis.

True False

An object having actually a temperature of 300 would certainly be ideal oboffered through an infrared telescope. → True

True False

Since gamma rays have incredibly short wavelengths, gamma-ray telescopes have the right to attain incredibly high angular resolution. → False

True False

As a rule, larger telescopes can detect fainter objects. → False

True False True" type="hidden">

What is meant by the "prime focus" of a telescope? → The ideal feasible angular resolution that have the right to be obtained by a telescope of a offered size if all other resources of blurring are eliminated

True False The allude at which the incoming light is focused to develop a photo, where evaluation tools and imaging cameras can be placed" type="hidden">

The _______ ________ of the Hubble Gap Telescope is much better for shorter (bluer) wavelengths of light than for longer (redder) wavelengths of light → Angular resolution

True False

What is true of radio telescopes? → its capacity to identify 2 adjacent objects cshed together in the sky

True False They have actually poorer angular resolution than a refractor." type="hidden">

When multiple radio telescopes are used for interferomeattempt, resolving power is many boosted by enhancing → the distance in between telescopes

True False

The Hubble Void Telescope is the biggest optical telescope ever before constructed. T/F → False

True False False.The HST owes its photo quality (after correction for an error in the primary mirror) to the lack of atmospheric blurring." type="hidden">

Radio observations might be made in the daytime and at night. T/F → False

True False True.Yes. Although the Sun is a radio source, it does not interfere unduly via daytime use of radio telescopes." type="hidden">

Radio telescopes are big in part to improve their angular resolution, which is poor bereason of the lengthy wavelengths at which they are supplied to observe the skies. → False.Gamma-ray telescopes work by absorbing high-power pholots, not by showing or refracting them.

True False True" type="hidden">

The big study observatories on Mauna Kea use giant ________ __________. → grazing incidence

True False Reflecting telescopes" type="hidden">

Cassegrain-style telescopes are characterized by a hole in the objective mirror. T/F → True.The resulting folded optical path is provided in many commercial amateur and professional telescope deindications.

True False

The term seeing is used to describe just how faint an item deserve to be detected by a telescope. → False

True False

Large arrays of widely separated radio telescopes have the right to achieve very excellent resolution. What is the primary factor that such excellent resolutions cannot be completed by individual radio telescopes operating individually → solve finer detail

True False Radio dishes bigger than a couple of 10s of meters across are hard to construct, limiting their individual resolutions to several times worse than the biggest optical mirrors." type="hidden">

CCD detectors gather light 10-20 times faster than the the majority of sensitive photographic film. → fix finer detail

True False True" type="hidden">

A telescope architecture that provides a lens and no mirrors is a refractor. → Reflecting telescopes, in part bereason large lenses and also mirrors sag under their very own weight, and also it is much easier to support a mirror alengthy its whole earlier side than it is to assistance a lens just approximately its edge

True False True" type="hidden">

The major function of a telescope is to administer a amplified image of the stars. T/F → False.Magnification is second. Almost all stars appear as just points of light through even the a lot of effective telescopes. Light-gathering power and also readdressing power are the a lot of important properties of huge telescopes.

True False

The main advantage to using the HST is the boosted amount of "night time" viewing it affords. → Earth is a warmth source and the telescope need to be maintained incredibly cool.

True False False" type="hidden">

The Chandra X-Ray observatory concentrates X rays through _________ _________ mirrors. → Reflecting telescopes

True False grazing incidence" type="hidden">

Radio waves have the right to penetrate dusty areas of interstellar space bereason they are fairly unimpacted by this intervening issue. T/F → True. Many type of parts of interstellar room (including the facility of our Galaxy) cannot be checked out at optical wavelengths, but are conveniently detectable in the radio region.

True False

The amount of diffraction and hence the resolution of the scope counts upon → its capacity to differentiate two nearby objects cshed together in the sky

True False the wavesize used and also the size of the main telescope objective lens or mirror." type="hidden">

What is a CCD? → An electronic imaging detector

True False

What is meant in astronomy by the phrase "energetic optics"? → Rapid modifications are made to the tilt and area of the facets of a telescope to correct for the effects of atmospheric and critical distortion.

True False

CCD camages and also photographic film have approximately the same performance for collecting light. T/F → False.Although CCD camages have replaced photogenic film in a lot of applications, film is still used or some specialized applications.

True False

Radio telescopes regularly place their detectors at prime focus. T/F → True.Section 5.5 of the text and the virtual photo archive for Chapter 5 contain many type of images mirroring such arrangements.

True False

One obstacle in structure big radio telescopes is getting the big surencounters smooth enough to act as mirrors. T/F → False.Since radio waves have actually fairly lengthy wavelengths, centimeters to meters, the reflector surdeals with perform not need to be very smooth.

True False

A telescope through a 2-m diameter main mirror would be more influenced by diffraction than one through a 1-m-diameter mirror. T/F → simple stars

True False False.The diffractivity limit on resolution would certainly actually be better (smaller) for the larger telescope." type="hidden">

Contrasted to optical telescopes, radio telescopes are developed huge bereason → radio pholoads do not lug a lot energy.

True False

All wavelengths of light travel at the same speed in a vacuum, and also lug the exact same energy per photon. → false

True False

If telescope mirrors can be made of odd sizes, the one via the many light-gathering power would certainly be → True.Yes. Although the Sun is a radio source, it does not interfere unduly via daytime use of radio telescopes.

True False rectangle through 2 1- sides and also 2 2- sides." type="hidden">

What problem does adaptive optics correct? → turbulence in the earth"s atmosphere which creates twinkling

True False

Infrared astronomy can just be done from space. → False

True False

Contrasted with radio telescopes, optical telescopes can → They have poorer angular resolution than a refractor.

True False fix finer detail" type="hidden">

The twin 10-m Keck telescopes can occupational together to achieve much better angular resolution through a method well-known as __________. → interferometry

True False

Chromatic aberration affects reflector telescopes. → They have actually poorer angular resolution than a refractor.

True False False" type="hidden">

Like radio and also optical astronomy, infrared astronomy is quickly done via ground-based telescopes. → False

True False

The amount of light collected by a telescope is proportional to its area. T/F → the wavelength provided and also the dimension of the major telescope objective lens or mirror.

True False True.This is the reason that astronomers require larger telescopes to study fainter objects." type="hidden">

Radio telescopes using extremely long baseline interferomeattempt have created imeras with reoptions similar to those of images developed via optical telescopes. T/F → True.Section 5.5 of the message and also the digital photo archive for Chapter 5 contain many kind of photos mirroring such arrangements.

True False True. As much as refixing power is involved, the reliable diameter of an interferometer is the distance between its outerthe majority of dishes." type="hidden">

The Earth"s setting is the significant variable limiting the use of ground-based radio telescopes. → False

True False

Galileo"s telescope deindicators using lenses were examples of _________ ________. → True

True False refracting telescopes" type="hidden">

All modern-day huge optical telescopes are refractors. → False

True False

The opacity of the environment is partially corrected through adaptive optics. → false

True False

Which kind of telescope did Galileo turn skyward in 1610? → single lens refractor

True False

What is photo processing? → Computer handling of digital imeras to correct for defects and rerelocate noise

True False

Which of the following statements around the usage of infrared telescopes is true? → its capacity to identify two nearby objects cshed together in the sky

True False The detector and also telescope should be coobrought about exceptionally low temperatures." type="hidden">

The Keck telescopes contain the largest single mirrors ever created. → False.The HST owes its photo high quality (after correction for an error in the major mirror) to the lack of atmospheric blurring.

True False False" type="hidden">

The the majority of vital benefit of CCDs over film is that → The most

True False they document much more light in a given expocertain time." type="hidden">

Ultraviolet and also X-ray telescopes have the right to be provided just over Earth"s atmosphere. T/F → True.The atmosphere is opaque to electromagnetic radiation higher in frequency (i.e., shorter in wavelength) than the close to ultraviolet, so UV and also X-ray astronomy must be carried out from room. Gamma rays, but, have the right to be observed from the ground—not straight, but by observing the results of their interactions through the setting.

True False

Photography with film is still the wanted way of capturing fine detail in the faintest, the majority of far-off galaxies. → they document a lot more light in a offered expocertain time.

True False False" type="hidden">

The Spitzer Void Telescope (SST) is stationed much from Planet because → False

True False Earth is a warm source and also the telescope need to be maintained extremely cool." type="hidden">

Gamma-ray telescopes employ the same basic style that optical tools use. → False

True False

A significant advantage of a Newtonian reflector over a refractor is → True

True False the elimination of chromatic aberration." type="hidden">

_____________ sepaprice the various colors of light, permitting astronomers to recognize stellar complace and also might various other stellar properties. → Spectrographs

True False

The biggest telescopes in use this day are reflectors, not refractors. T/F → True.The largest telescopes in all wavesize areas from radio to X-rays are all reflectors.

True False

Reflecting telescopes normally endure from chromatic aberration. T/F → False.Chromatic aberration is connected with refracting telescopes

True False

features of telescopes → They have poorer angular resolution than a refractor.

True False chapter 3 sorting task" type="hidden">

How much more light would a 2-m-diameter telescope gather in a details amount of time at a provided wavelength compared via one that is 50 cm in diameter? → 16 times

True False

Stars do not twinkle; the instcapability of the setting causes this impact. → True

True False

An optical telescope of a given dimension would certainly have much better resolution in orange light than in blue light. T/F → Cassegrain

True False False.The diffractivity limit to resolution would be bigger, producing worse resolution, in orange light than in blue light for a offered telescope." type="hidden">

Radio telescopes would not recurrent a great choice for huge examine of which of the following types of object? → Reflecting telescopes, in component bereason huge lenses and also mirrors sag under their own weight, and it is less complicated to support a mirror alengthy its entire earlier side than it is to assistance a lens only about its edge

True False simple stars" type="hidden">

What difficulty perform refractor telescopes have that reflectors don"t? → chromatic aberration

True False

Radio telescopes have actually poorer angular resolution than optical telescopes because radio waves have actually a a lot longer wavesize than optical waves. → True.Section 5.5 of the message and also the digital picture archive for Chapter 5 contain many type of images reflecting such arrangements.

True False True" type="hidden">

What type of single telescope presently in procedure has actually the greatest angular resolution? → Cassegrain

True False Optical" type="hidden">

The thickest lenses deflect and also bfinish light → The most

True False

What is the resolution of a telescope? → They have actually poorer angular resolution than a refractor.

True False its ability to distinguish two surrounding objects cshed together in the sky" type="hidden">

The image presented in Figure 5.10 in the textbook ("Resolution") is sharpest as soon as the ratio of wavesize to telescope dimension is → Rapid adjustments are made to the tilt and also place of the aspects of a telescope to correct for the results of atmospheric and instrumental distortion.

True False small" type="hidden">

What form of telescope emphasis is behind a central hole in the major mirror? → False

True False Cassegrain" type="hidden">

It is difficult to get rid of the atmospheric blurring competent by ground-based optical telescopes. T/F → False

True False False.Active and/or adaptive optics have the right to be supplied to compensate for much of the distortion of light as a result of atmospheric turbulence." type="hidden">

One of the main benefits of CCDs over photographic plates is the former"s high effectiveness in detecting light. → they record a lot even more light in a offered expocertain time.

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True False True" type="hidden">

Galileo is attributed via making the initially reflector telescope. → False

True False

The main reason that a lot of experienced research telescopes are reflectors is that → False

True False huge mirrors are less complicated to construct than huge lenses." type="hidden">

A 10-meter telescope has a larger __________-_________ _____ than a 4-meter telescope. → light-collecting area

True False

Gamma-Ray telescopes are difficult to make bereason they need huge lenses or mirrors for concentrating in order to make imeras. T/F → False.Gamma-ray telescopes work-related by absorbing high-power pholoads, not by mirroring or refracting them.

True False

One benefit of the Hubble Void telescope over ground based ones is that → False

True False in orlittle bit, it have the right to operate close to its diffractivity limit at visible wavelengths." type="hidden">

Which of the following is an benefit the Hubble Void Telescope has over ground-based telescopes? → There is no blurring because of the atmosphere

True False

What is the major factor that ultraviolet astronomy must be done in space? → its ability to differentiate 2 adjacent objects cshed together in the sky

True False Earth's environment absorbs the majority of ultraviolet wavelengths" type="hidden">