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5.0
Astro 101 Questions with Detailed Verified Answers
(100% Correct Answers) /Already Graded A+
Quiz: Melanoheliophobia
Ans: An irrational fear of black holes
Quiz: What are the three main attributes of photons?
Ans: Frequency, Wavelength, Energy
Quiz: If a photon's frequency is increased by a factor of two, what
happens to its wavelength?
Ans: Its wavelength decreases by a factor of two
Quiz: If a photon's wavelength is increased by a factor of two, what
happens to its frequency?
Ans: Its frequency is decreased by a factor of two
Quiz: If a photon's wavelength is increased by a factor of two, what
happens to its energy?
Ans: Its energy is decreased by a factor of two
Quiz: The regions of the electromagnetic spectrum in order of
increasing energy
Ans: Radio, infrared, visible, ultraviolet, x-rays, gamma rays
18:36:59
,Quiz: What is incandescence?
Ans: The emission of electromagnetic radiation from a hot body as a result
of its temperature.
Quiz: What is luminescence?
Ans: The emission of light by a substance that has not been heated, as in
fluorescence and phosphorescence.
Quiz: What is the Doppler effect?
Ans: The Doppler effect occurs when a source of sound or light is moving
relative to someone observing it
Quiz: If a light source moves toward you, what would you observe?
Ans: You would observe blue-shifted light
Quiz: You observe that light from a star has a longer wavelength than
expected. What is a possible explanation?
Ans: The star may be moving away from you
Quiz: What effect does gravity have on light?
Ans: Gravity bends the path that light follows
Examstudy - Stuvia US
,Quiz: Two stars are near each other, and experience gravitational force
between them. What happens if the distance between them is
decreased by a factor of two?
Ans: The gravitational force increases by a factor of four
Quiz: Two stars are near each other, and experience gravitational force
between them. What happens if the mass of one star is increased by a
factor of two?
Ans: The gravitational force increases by a factor of two
Quiz: Two stars are near each other, and experience gravitational force
between them. What does Newton's third law say about them?
Ans: The stars each experience the same force, but in opposite directions
Quiz: What is weight?
Ans: Weight is the apparent force due to gravity as something is pulled
against a planet's surface
Quiz: If a thing is initially at rest, what happens to its kinetic energy as it is
gravitationally pulled toward a massive object
Ans: Its gravitational potential energy is changed into kinetic energy
Quiz: When does an object have "escape velocity"?
Examstudy - Stuvia US
, Ans: Escape velocity is when an object has enough kinetic energy to
escape a gravitational field
Quiz: What is a dark star?
Ans: A dark star has a surface escape velocity equal to the speed of light
Quiz: What is the relationship between a dark star and a black hole?
Ans: A dark star with a stable surface does not exist in nature, while a black
hole with an event horizon at the same place as the dark star's surface exists
and can be observed.
Quiz: What phenomena might black holes help explain?
Ans: Dark matter, dark energy
Quiz: What is the event horizon of a black hole?
Ans: The event horizon is the radius within which light cannot escape a
black hole
Quiz: What is a star?
Ans: A star is a self-gravitating body of gas which is massive enough to
sustain fusion
Quiz: What is hydrostatic equilibrium in a star?
Ans: Hydrostatic equilibrium is when gas pressure balances gravity
Examstudy - Stuvia US
In today's fast-paced educational landscape, students need reliable resources to excel in their studies.
5.0
Astro 101 Questions with Detailed Verified Answers
(100% Correct Answers) /Already Graded A+
Quiz: Melanoheliophobia
Ans: An irrational fear of black holes
Quiz: What are the three main attributes of photons?
Ans: Frequency, Wavelength, Energy
Quiz: If a photon's frequency is increased by a factor of two, what
happens to its wavelength?
Ans: Its wavelength decreases by a factor of two
Quiz: If a photon's wavelength is increased by a factor of two, what
happens to its frequency?
Ans: Its frequency is decreased by a factor of two
Quiz: If a photon's wavelength is increased by a factor of two, what
happens to its energy?
Ans: Its energy is decreased by a factor of two
Quiz: The regions of the electromagnetic spectrum in order of
increasing energy
Ans: Radio, infrared, visible, ultraviolet, x-rays, gamma rays
18:36:59
,Quiz: What is incandescence?
Ans: The emission of electromagnetic radiation from a hot body as a result
of its temperature.
Quiz: What is luminescence?
Ans: The emission of light by a substance that has not been heated, as in
fluorescence and phosphorescence.
Quiz: What is the Doppler effect?
Ans: The Doppler effect occurs when a source of sound or light is moving
relative to someone observing it
Quiz: If a light source moves toward you, what would you observe?
Ans: You would observe blue-shifted light
Quiz: You observe that light from a star has a longer wavelength than
expected. What is a possible explanation?
Ans: The star may be moving away from you
Quiz: What effect does gravity have on light?
Ans: Gravity bends the path that light follows
Examstudy - Stuvia US
,Quiz: Two stars are near each other, and experience gravitational force
between them. What happens if the distance between them is
decreased by a factor of two?
Ans: The gravitational force increases by a factor of four
Quiz: Two stars are near each other, and experience gravitational force
between them. What happens if the mass of one star is increased by a
factor of two?
Ans: The gravitational force increases by a factor of two
Quiz: Two stars are near each other, and experience gravitational force
between them. What does Newton's third law say about them?
Ans: The stars each experience the same force, but in opposite directions
Quiz: What is weight?
Ans: Weight is the apparent force due to gravity as something is pulled
against a planet's surface
Quiz: If a thing is initially at rest, what happens to its kinetic energy as it is
gravitationally pulled toward a massive object
Ans: Its gravitational potential energy is changed into kinetic energy
Quiz: When does an object have "escape velocity"?
Examstudy - Stuvia US
, Ans: Escape velocity is when an object has enough kinetic energy to
escape a gravitational field
Quiz: What is a dark star?
Ans: A dark star has a surface escape velocity equal to the speed of light
Quiz: What is the relationship between a dark star and a black hole?
Ans: A dark star with a stable surface does not exist in nature, while a black
hole with an event horizon at the same place as the dark star's surface exists
and can be observed.
Quiz: What phenomena might black holes help explain?
Ans: Dark matter, dark energy
Quiz: What is the event horizon of a black hole?
Ans: The event horizon is the radius within which light cannot escape a
black hole
Quiz: What is a star?
Ans: A star is a self-gravitating body of gas which is massive enough to
sustain fusion
Quiz: What is hydrostatic equilibrium in a star?
Ans: Hydrostatic equilibrium is when gas pressure balances gravity
Examstudy - Stuvia US
