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2. Question 1 Which of these is NOT a form of electromagnetic radiation?
Gamma rays
Infrared
Sound
Visible light
Radio
Answer: c
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3. Question 1 Which of these is NOT a form of electromagnetic radiation?
Gamma rays
Infrared
Sound
Visible light
Radio
Explanation: Sound comes from pressure waves; all others are types of electro- magnetic radiation of different wavelengths.
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4. Question 2
The distance between successive wave crests defines the _____ of a wave.
wavelength
frequency
period
amplitude
energy
Answer: a
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5. Question 2
The distance between successive wave crests defines the _____ of a wave.
wavelength
frequency
period
amplitude
energy
Explanation: Light can range from short-wavelength gamma rays to long-wavelength radio waves.
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6. Question 3
The frequency at which a star’s intensity is greatest depends directly on its
radius.
mass.
magnetic field.
temperature.
direction of motion.
Answer: d
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7. Question 3
The frequency at which a star’s intensity is greatest depends directly on its
radius.
mass.
magnetic field.
temperature.
direction of motion.
Explanation: Wien’s law means that hotter stars produce much more high-frequency light.
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8. Question 4
Rigel appears as a bright bluish star, whereas Betelgeuse appears as a bright reddish star.
Rigel is _____ Betelgeuse.
cooler than
the same temperature as
older than
hotter than
more massive than
The constellation ORION
Betelgeuse
Rigel
Answer: d
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9. Question 4
Rigel appears as a bright bluish star, whereas Betelgeuse appears as a bright reddish star.
Rigel is _____ Betelgeuse.
cooler than
the same temperature as
older than
hotter than
more massive than
Explanation: Hotter stars look bluer in color; cooler stars look redder.
The constellation ORION
Betelgeuse
Rigel
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10. Question 5 If a light source is approaching you, you will observe that
its spectral lines are redshifted.
the light is much brighter.
its spectral lines are shorter in wavelength.
the amplitude of its waves has increased.
its photons have increased in speed.
Answer: c
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11. Question 5 If a light source is approaching you, you will observe that
its spectral lines are redshifted.
the light is much brighter.
its spectral lines are shorter in wavelength.
the amplitude of its waves has increased.
its photons have increased in speed.
Explanation: The Doppler shift explains that wavelengths from sources approaching us are blueshifted.
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12. Question 6 The wavelengths of emission lines produced by an element
depend on its temperature.
are identical to its absorption lines.
depend on its density.
are different from its absorption lines.
depend on its intensity.
Answer: b
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13. Question 6 The wavelengths of emission lines produced by an element
depend on its temperature.
are identical to its absorption lines.
depend on its density.
are different from its absorption lines.
depend on its intensity.
Explanation: Elements absorb or emit the same wavelengths of light based on their electron energy levels.
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14. Question 7
Analyzing a star’s spectral lines can tell us about all of these EXCEPT its
composition.
surface temperature.
transverse (side-to-side) motion.
rotation.
density.
Answer: c
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15. Question 7
Analyzing a star’s spectral lines can tell us about all of these EXCEPT its
composition.
surface temperature.
transverse (side-to- side) motion.
rotation.
density
Explanation: Only motion toward or away from us influences a star’s spectral lines. Spectra can also tell us about a star’s magnetic field.
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16. Question 8
What types of electromagnetic radiation from space reach the surface of Earth?
radio waves and microwaves
X-rays and ultraviolet light
infrared and gamma rays
visible light and radio waves
visible and ultraviolet light
Answer: d
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17. Question 8
What types of electromagnetic radiation from space reach the surface of Earth?
radio waves and microwaves
X-rays and ultraviolet light
infrared and gamma rays
visible light and radio waves
visible and ultraviolet light
Explanation: Earth’s atmosphere allows radio waves and visible light to reach the ground.
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18. Question 9
Which of the following has a fundamentally different nature than the other four?
Proton
Electron
Neutron
Atomic nucleus
Photon
Answer: e
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19. Question 9
Which of the following has a fundamentally different nature than the other four?
Proton
Electron
Neutron
Atomic nucleus
Photon
Explanation: Photons are packages of light energy. Protons, neutrons, and electrons are particles of matter within an atomic nucleus.
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