Quiz8x

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Nov 16, 2013 (3 years and 11 months ago)

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Quiz 8

Astro 170

Fall 2011

Prof. Bechtold

Correct answers in
bold face
.


1.
Because we live on Earth, our eyes have evolved to be sensitive to

A

Gamma Rays

B

X
-
rays

C

Ultraviolet light

D

Visible light

E

Infrared Light


2.
Astronomers use the Doppler shift to measure

A

the temperature of celestial objects

B

the size of celestial objects

C

the shape of celestial objects

D

the age of celestial objects

E

the radial velocity of celestial objects


3.
When we used the infrared
camera in class, the ice cubes appeared dark because

a. water absorbs infrared light

b. ice reflects less infrared light than the rest of the room

c.
ice is colder than the rest of the room

d. ice reflects more infrared light than the rest of the room

e. ice emits mostly visible light


4.
If we say that a material is opaque to infrared light, we mean that

a. it emits infrared light

b. it transmits infrared light

c. it reflects infrared light

d.
it absorbs infrared light

e. none of the above


5.
If

R is the distance between two gravitating bodies, then the force of gravity
produced by one on the other is

a. proportional to R

b. proportional to R
2

c. inversely proportional to R

d.
inversely proportional to R
2

e. independent of R






6.
Periodic

oscillations of electromagnetic fields are called

a. heat

b.
light

c. chromatic aberration

d. turbulance

e. sound


7.
Turbule
nce in the air causes blurring of images of celestial objects, an effect which
astronomers call

a. resolution

b.
seeing

c.
chaos

d. interferometry

e. chromatic aberration


8. Radio astronomers combine light from widely spaced telescopes in order to make
sharp images, a technique called

a. resolution

b. seeing

c. chaos

d.
interferometry

e. chromatic aberration


9. One of

the reasons astronomers use cameras sensitive to infrared light is

a. they are cheaper than cameras sensitive to visible light

b.
they let us see through the dust that obscures visible light

c. they let us see objects as they will be in the future

d.
they let us see fainter objects than similar cameras that are sensitive to visible
light

e. they let us see smaller objects than similar cameras that are sensitive to visible
light


10.
From shortest to longest wavelength, which of the following correctly

orders the
different categories of electromagnetic radiation?

a.
Gamma rays, X rays, visible light, ultraviolet, infrared, radio

b.
Infrared, visible light, ultraviolet, X rays, gamma rays, radio

c.
Gamma rays, X rays, ultraviolet, visible light, infrar
ed, radio


d.
Radio, infrared, visible light, ultraviolet, X rays, gamma rays

e. None of these are correctly ordered.