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What is meant by spectral resolution? A) It is a measure of how much energy an object emits in different parts of the electromagnetic spectrum. B) It is a measure of how close two spectral lines can be distinguished. C) It is a measure of how close two point sources can be distinguished. D) It...

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  • August 28, 2024
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  • 2024/2025
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ASTR 102 exam Prep Questions & 100%
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What is meant by spectral resolution?



A) It is a measure of how much energy an object emits in different parts of the electromagnetic
spectrum.

B) It is a measure of how close two spectral lines can be distinguished.

C) It is a measure of how close two point sources can be distinguished.

D) It is the same as angular resolution when applied to telescopes operating at different wavelengths. -
✔✔B) It is a measure of how close two spectral lines can be distinguished.



Which of the following studies is best suited to a timing experiment?



A) studying how different stars differ in their chemical compositions

B) studying whether a particular star's brightness is steady or variable

C) determining the age of the solar system

D) measuring the rotation rate of a distant star

E) estimating the time since the Big Bang - ✔✔B) studying whether a particular star's brightness
is steady or variable



Which of the following is always true about images captured with X-ray telescopes?



A) They are always very pretty.

B) They are always displayed with the highest possible angular resolution.

C) They are always useful for seeing through things.

D) They are always displayed in false color.

,E) They are always displayed with north pointing upward in the images. - ✔✔D) They are
always displayed in false color.



What do astronomers mean by light pollution?



A) Light pollution refers to pollution caused by light industry as opposed to heavy industry.

B) Light pollution refers to harmful gases emitted by common street lights.

C) Light pollution refers to light used for human activities that brightens the sky and
hinders astronomical observations.

D) Light pollution refers to the lights that must be used inside major observatories and that make
it difficult for astronomers' eyes to adapt to darkness.

E) Light pollution is another name for sunlight, which makes it impossible to see stars in the daytime.
- ✔✔C) Light pollution refers to light used for human activities that brightens the sky and hinders
astronomical observations.



What causes stars to twinkle?



A) It is intrinsic to the stars—their brightness varies as they expand and contract.

B) variations in the absorption of the atmosphere

C) variable absorption by interstellar gas along the line of sight to the star

D) bending of light rays by turbulent layers in the atmosphere

E) the inability of the human eye to see faint objects - ✔✔D) bending of light rays by turbulent layers
in the atmosphere



What is the purpose of adaptive optics?



A) to improve the angular resolution of telescopes in space

B) to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground

C) to increase the collecting area of telescopes on the ground

D) to increase the magnification of telescopes on the ground

, E) to allow several small telescopes to work together like a single larger telescope - ✔✔B)
to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground



What is an artificial star?



A) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric
fluctuations

B) a satellite orbiting Earth

C) a meteor

D) a possible source of dark matter in the universe

E) the unseen member of a binary star system - ✔✔A) a point of light in Earth's atmosphere
created by a laser for the purpose of monitoring atmospheric fluctuations




Which of the following is not a good reason to place observatories on remote mountain tops?



A) to reduce light pollution

B) to reduce light distortion

C) to reduce light absorption

D) to be able to observe at radio wavelengths

E) to be able to observe at infrared wavelengths - ✔✔D) to be able to observe at radio wavelengths



Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?



A) New telescopes incorporate new technology to increase their efficiency.

B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths.

C) Photons of different energy behave differently and require different collection strategies.

D) Light pollution is worse at radio wavelengths than visible wavelengths.

E) Astronomers and engineers enjoy the challenge of making new telescope designs. - ✔✔C)
Photons of different energy behave differently and require different collection strategies.

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