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AST 111 Exam | Questions with Verified Answers
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AST 111 Exam | Questions with Verified Answers
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AST 111 Exam | Questions with VerifiedAnswers
Einstein's theory, like Newton's, predicts that, in the absence of air resistance, all objects should
fall at the same rate regardless of their masses. Consider the following hypothetical
experimental results. Which one would indicate a failure of Einstein's theory? - ✔✔Scientists
dropping balls on the Moon find that balls of different mass fall at slightly different rates.
According to the law of universal gravitation, what would happen to Earth if the Sun were
somehow replaced by a black hole of the same mass? - ✔✔Earth's orbit would not change.
If Earth were twice as far from the Sun, the force of gravity attracting Earth to the Sun would be
- ✔✔one-quarter as strong.
If the Moon were closer to Earth, high tides would - ✔✔Be higher than they are now
Consider the statement "There's no gravity in space." This statement is: - ✔✔Completely
False.
Electromagnetic Spectrum - ✔✔All light has the same speed.
Compared to red light, blue light has higher frequency and - ✔✔higher energy and shorter
wavelength.
Radio waves are: - ✔✔a form of light.
Which of the following are forms of light (electromagnetic radiation)?
Select all that apply. - ✔✔radio waves
,ultraviolet
gamma rays
microwaves
visible light
infrared
X rays
Red light has a _____ wavelength and a _____ frequency than does blue light. - ✔✔longer,
lower
X ray photons have a _____ wavelength, _____ frequency, and _____ energy than do ultraviolet
photons. - ✔✔Shorter, higher, higher
If you have a telescope that is observing light with wavelengths of a few meters, you are
observing __________. - ✔✔radio waves.
Suppose that you had "X-ray vision" that allowed you to see X rays. What would you notice
when you looked at a friend standing near you that you could not notice with your visible light
vision alone? - ✔✔nothing
Why is a sunflower yellow? - ✔✔It reflects yellow light.
Rank these colors of visible light from left to right based on the altitude in the atmosphere
where they are completely absorbed, from highest to lowest (Earth's surface). If two (or more)
of the choices reach the surface, rank them as equal by dragging one on top of the other(s). -
✔✔all wavelengths of visible light reach Earth's surface, which is why we can see all colors
and why visible-light telescopes work fine on the ground.
Thermal radiation gets its name because __________. - ✔✔its spectrum depends on the
temperature of the object emitting it
, Compared to a cold object, a hotter object of the same size emits most of its light at
__________ wavelengths and emits _____ light overall. - ✔✔shorter, more.
Imagine being on the Moon and looking at the thermal radiation spectrum of Earth. How would
it compare to the spectra shown on the graph in the video? - ✔✔It would be very similar to
the spectrum of the human.
Consider a planet orbiting another star that is very similar to our Sun. Assume the planet is
about the size of Earth and has an Earth-like orbit around its star. Which of the following
statements are true about the light coming from the star and planet?
Select all that apply. - ✔✔-The planet emits virtually all its light as infrared light.
-The star emits much more total light than the planet.
-The star's spectrum peaks in visible light.
Incandescent light bulbs emit thermal radiation because their filaments are heated to about
2500 Kelvin. LED light bulbs emit only at particular visible wavelengths. Why do incandescent
bulbs require more energy to shine with the same amount of visible light as LED bulbs? -
✔✔Incandescent bulbs emit most of their energy as infrared light.
Study the graph of the intensity of light versus wavelength for continuous spectra, observing
how it changes with the temperature of the light bulb. Recall that one of the laws of thermal
radiation states that a higher-temperature object emits photons with higher average energy
(Wien's law). This law is illustrated by the fact that for a higher temperature object, the graph
peaks at __________. - ✔✔A shorter wavelength.
Click "show" for the emission line spectrum, then click "choose gases" and study the emission
line spectrum for neon. The neon "OPEN" sign appears reddish-orange because __________. -
✔✔neon atoms emit many more yellow and red photons than blue and violet photons
The absorption line spectrum shows what we see when we look at a hot light source (such as a
star or light bulb) directly behind a cooler cloud of gas. Suppose instead that we are looking at
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