Chapter 5 Quiz
1. What is light?
·
Light is an electromagnetic wave that also comes
in individual “pieces” called photons. Each photon has a precise wavelength,
frequency and energy.
·
Forms of light are: radio waves, microwaves,
infrared, visible light, ultraviolet, X-rays and gamma rays
2. What is matter?
·
Ordinary matter is made of atoms, which are made
of protons, neutrons and electrons.
3. How do light and matter interact?
·
Matter can emit light, absorb light, transmit
light or reflect light
4.What types of light spectra can we observe?
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Thermal radiation spectrum – looks like rainbow
of light
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Absorption line spectrum – specific colors are
missing from the rainbow
·
Emission line spectrum– see light only of a
specific color
5. How does light tell us what things are made of?
·
Every kind of atom, ion, and molecule produces a
unique set of spectral lines
6. How does light tell use the temperatures of planets and
stars?
·
We can determine temperature from the spectrum
of thermal radiation
7. How does light tell us the speed of a distant object?
·
The Doppler effect tells us how fast an object
is moving toward or away from us.
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Blueshift:objects moving toward us
·
Redshift: objects moving away from us
8. How do telescopes help us learn about the universe?
·
We can see fainter objects and more detail than
we can see by eye. Specialized telescopes allow us to learn more than we could
from visible light alone.
9. Why do we put telescopes in space?
·
They are above earth’s atmosphere and therefore
not subject to light pollution, atmospheric distortion, or atmospheric
absorption of light.
10. How is technology revolutionizing astronomy?
·
It makes possible more powerful and more capable
telescopes
·
Adaptive optics
·
Interferometry
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