Question 1 (1 point) What is light? Q
Question 1 (1 point)
What is light?
Question 1 options:
A)
Radiant energy in the form of a stream of energy particles, called
quanta (sometimes called photons).
B)
Radiant energy in the form of a wave of electromagnetic energy.
C)
Both A and B.
D)
Neither A nor B.
Save Question 2 (1 point)
Assuming that light could curve around the Earth, about how long would it take for one trip?
Question 2 options:
1/7 second (s).
1 s.
7 s.
7 m.
Save Question 3 (1 point)
What is the approximate wavelength of red light?
Question 3 options:
5 m.
7 cm.
400 nm.
700 nm.
Save Question 4 (1 point)
List the following types of electromagnetic radiation in the order short to long wavelength.
Question 4 options:
gamma rays, X rays, ultraviolet, visible light, infrared (IR), radio waves.
radio waves, IR, visible light, ultraviolet, X rays, gamma rays.
gamma rays, X rays, IR, visible light, ultraviolet, radio waves.
radio waves, ultraviolet, visible light, IR, X rays, gamma rays.
Save Question 5 (1 point)
List the following types of electromagnetic radiation from lowest to highest energy.
Question 5 options:
gamma rays, X rays, ultraviolet, visible light, IR, radio waves.
radio waves, IR, visible light, ultraviolet, X rays, gamma rays.
gamma rays, X rays, infrared, visible light, ultraviolet, radio waves
radio waves, ultraviolet, visible light, IR, X rays, gamma rays.
Save Question 6 (1 point)
According to Wien’s law, a hotter object will _____ a cooler object.
Question 6 options:
appear darker than,
radiate the same intensity of wavelengths as,
radiate more strongly at shorter wavelengths than,
appear the same color as.
Save Question 7 (1 point)
What is the difference between emission and absorption in an atom?
Question 7 options:
In emission, the nucleus goes from a lower to a higher orbit.
In emission, an electron goes from a higher to a lower orbit.
In absorption, an electron goes from a higher to a lower orbit.
Both b and c.
Save Question 8 (1 point)
What is the relationship between wavelength (λ) and frequency (ν)? (“c” is the speed of light).Question 8 options:
λν = c
λ/ν = c
ν/λ = c
λc = ν
Save Question 9 (1 point)
Which of these are effects of the Doppler shift?
Question 9 options:
When an object is moving toward us, the wavelengths of its light decrease.
When an object is moving away from us, the wavelengths of its light increase.
When an object accelerates, the wavelengths of its light become warmer.
Both a and b are correct.
Save Question 10 (1 point)
Of these gases in the Earth’s atmosphere, which strongly absorbs infrared
radiation?
Question 10 options:
A)
water vapor.
B)
nitrogen.
C)
ozone.
D)
both A and C
Save Question 11 (1 point)
Which gas(es) in the Earth’s atmosphere strongly absorb ultraviolet radiation?
Question 11 options:
ozone (O3) and oxygen (O2)
nitrogen (N2) and argon (A).
water vapor and carbon dioxide (CO2).
none of the above.
Save Question 12 (1 point)
What type of spectrum is emitted by a heated solid object (such as the filament
of an incandescent lamp)?
Question 12 options:
continuous
emission line
absorption
none of the above
Save Question 13 (1 point)
What type of spectrum is observed when the light from a hot, dense body is seen through a cooler, tenuous gas?
Question 13 options:
continuous
emission line
absorption line
none of the above
Save Question 14 (1 point)
What type of spectrum is emitted by a hot, tenuous gas?
Question 14 options:
continuous
emission line
absorption line
none of the above
Save Question 15 (1 point)
What are some of the things astronomers can learn from the spectra of astronomical objects?
Question 15 options:
Chemical composition,
Whether a gas or solid or combination, due to the type of spectrum.
How fast the objects are moving.
All of the above.
Save Question 16 (1 point)
How do astronomers calculate a telescope’s light collecting area (A)? (where r = radius of the telescope’s mirror or lens, and π is 3.14159).Question 16 options:
A = 2πr
A = πr2
A = 4πr2
A=4/3πr3
Save Question 17 (1 point)
Telescope A has a mirror twice the diameter of telescope B’s mirror. How does A’s light-gathering power compare to B’s?Question 17 options:
A gathers 1/2 the light that B does.
A gathers twice the light that B does.
A gathers 4 times the light that B does.
A gathers 1/4th as much light as B does.
Save Question 18 (1 point)
A telescope’s resolving power measures its ability to seeQuestion 18 options:
Fainter sources.
More distant sources.
Finer details in sources.
Larger sources.
Save Question 19 (1 point)
One way to increase the resolving power of a telescope is toQuestion 19 options:
Make its mirror bigger.
Make its mirror smaller.
Replace its mirror with a lens of the same diameter.
Observe objects using longer wavelengths.
Save Question 20 (1 point)
What causes the image of a star to twinkle or scintillate?Question 20 options:
Irregularities in the density of layers of Earth’s atmosphere, rapidly refracting the light.
The flickering fusion process in the stars.
A purely physiological reaction in the eye.
None of these answers is correct.
Save Question 21 (1 point)
What process limits a telescope’s resolving power?Question 21 options:
Reflection
Refraction
Diffraction
Distraction
Save Question 22 (1 point)
What is the difference between a reflecting and a refracting telescope?Question 22 options:
A reflecting telescope uses a lens to focus light; a refracting telescope uses a mirror.
A reflecting telescope uses a mirror to focus light; a refracting telescope uses a lens.
Both use a mirror to focus light, but a reflecting telescope uses mirrors elsewhere to bend light.
There is no difference. Refracting is an outmoded way of saying reflecting.
Save Question 23 (1 point)
Light travels ____ in water than in airQuestion 23 options:
faster
slower
at the same speed
perpendicular to
Save Question 24 (1 point)
Which of the these is a reason for using mirrors rather than lenses in telescopes?Question 24 options:
Lenses are more expensive to make than mirrors.
Most transparent materials focus light of different colors to different spots.
Lenses can only be supported by their edges, making them sag in the middle (mirrors can be supported from behind).
All of the above.
Save Question 25 (1 point)
Why use an interferometer?Question 25 options:
Its two widely-spaced mirrors act like one giant telescope with increased collecting area.
Its two widely-spaced mirrors act like one giant telescope with increased resolving power.
By putting one mirror above the other you can make the instrument much smaller.
It can detect light at wavelengths not available to single telescopes.
Save Question 26 (1 point)
Which of the following astronomical objects emit radiation mostly at non-visible wavelengths?Question 26 options:
dust clouds in space
hot gas surrounding black holes
cold interstellar gas clouds
all of the above
Save Question 27 (1 point)
Do astronomers use ground-based X-ray telescopes?Question 27 options:
Yes, because they can penetrate gas clouds.
No, because no astronomical objects emit x-rays.
No, because x-rays cannot get through the Earth’s atmosphere.
No, because astronomers have not yet devised detectors for x-rays.
Save Question 28 (1 point)
Why does the useful resolving power of a ground-based telescope not match it’s theoretical value?Question 28 options:
Mirrors can’t be built accurately enough.
The atmosphere blurs the image, decreasing the resolving power.
Mirrors cannot collect enough light to reach their theoretical expectations.
The theoretical value can only be reached when there is a Full Moon.
Save Question 29 (1 point)
On some telescopes, actuators on the mirror change its shape to match distortions in the atmosphere. What is this technique called?Question 29 options:
Actuary observing
Interferometry.
Refraction
Adaptive Optics
Save Question 30 (1 point)
Which of the following is a reason to build an observatory in space?Question 30 options:
They are much less expensive than ground-based observatories.
They can last forever.
To avoid atmospheric blurring.
There is no good reason to build a space-based observatory.
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