As electrons decay from the excited state to ground
state:
a. they liberate energy b. they produce electromagnetic
waves c. spectral lines are emitted
d. they emit EM waves of specific frequencies
e. all the above are correct.
On the basis of spectra emitted by objects we can tell:
a. their state (in part) b. their composition
c. their temperature d. their motion e. all the above.
A bright LINE emission spectrum is produced by:
a. a hot dense gas b. a hot non-dense gas
c. a cool solid d. a hot liquid e. a hot solid
The blue shift of a star's spectrum tells you:
a. that the star has a hot surface b. that
fusion reactions are taking place c. that the star is stable
d. that the star is moving e. that the star is old.
Suppose that the velocity of a wave is constant. As
we increase the wavelength:
a. amplitude increases b. amplitude decreases
c. frequency increases d. frequency decreases e. the
distance from crest to crest decreases.
The EM radiation with the shortest wavelength is:
a. infrared b. visible
c. radar d. X rays e. radio
.
If the sun were to disappear right now, we would
not know it for 8 minutes because:
a. the sun is so large it would take it 8 min to
disappear b. it would take 8 minutes for the equipment we have to
record the change c. it takes light 8 min to get here from
the sun d. all three are correct e. none are correct
The velocity of light in a vacuum:
a. increases as the source moves towards you
b. decreases as the source moves away from you
c. constant regardless of the motion of the source.
d. constant only if the source is moving parallel to you e.
it varies, so all the above could be true
If the frequency of an electromagnetic wave (such as
light) in space were decreased, which of the following would occur?
a. velocity would increase
b. height would increase c. wavelength would increase
d. wavelength would decrease e. none of these would
occur, because frequency is not
related to any of these variables.
If the peak emission of an object were located in the
infra-red, which of the following would be a correct statement?
a. it would give off mostly heat b.
you could read this exam by its light c. it would be cooler
than a radio emitter d. it would be hotter than
an X-ray source e. it would give off infra-red
In lab, we used line spectra to tell:
a. temperature b. motion
c. density d. composition e. none of these
Which of the following colors is NOT an acceptable
emission color of the visible spectrum to moi?
a) red b) green c) purple d)
yellow e) they're all ok by me
A blue shifted spectrum means:
a. motion away from the receiver
b. motion towards the receiver c. a higher temperature
d. a lower temperature e. none of these
The telescope you built with the lenses was of which
type?
a. Refracting (Galilean) b. Newtonian
c. Radio d. Cassegrainian e. none of these
The farther away in space we look:
a. the farther back in time we look
b. the slower light moves (red shift) c. the faster the
rotational
velocities of galaxies d. the cooler it gets
e. the more galaxies we see as space becomes more and less dense.
Which of the following is fundamentally different type
of wave from the others?
a. gamma rays b. X-rays c. visible
light waves d. sound waves e. radio waves
The correct sequence for: 1. red light 2. gamma
rays 3. radio 4. ultra-violet and 5. microwave in order of INCREASINGLY
higher frequency is:
a. 1,2,3,4,5 b. 2,3,1,5,4 c. 3,5,1,4,2
d.2,4,1,5,3, e. 3,5,1,2,4
Given: 1-red light 2-radar waves 3-ultraviolet
light
4-X-rays 5-indigo light 6-gamma rays, what is the
correct sequence of these waves based on INCREASING energy?
a. 1,2,5,6,4,6 b.2,1,5,3,4,6 c.6,4,3,5,2,1
d. 4,6,5,3,2,1 e.none of the above
Which of the following EM waves would have the least
energy?
a) red light b) ultraviolet
c) infrared d) radio e) radar
Peak emission tells us the ________ of an object:
a. temperature b. motion
c. density d. composition e. none of these
Which color star has a hotter surface (peak emission)?
a. red b. yellow c. green
d. indigo e. violet
The line spectra are given off by a:
a. solid b. liquid c. dense hot gas
d. dense cool gas e. thin (non-dense) hot gas
Look at diagram . Part A is?
a. height b. crest c.wavelength
d. frequency e. amplitude
Look at diagram Given the lab reference spectrum
on top and a spectrum from a star at the bottom we can say that that
star is:
a. moving towards us b. moving away
from us c. not moving relative to us
d. getting hotter all the time
e. all of these
The velocity of light in a vacuum:
a. always increases towards you
b. always decreases away from you c. constant only if the source
is moving with the earth d. always the same @ 186,000
mi/s e. none of the above
The red shift of a star's spectrum tells you:
a. that the star has a hot surface b. that
fusion reactions are taking place
c. that the star is stable d.
that the star is moving e. that the star is old.
Telescopes:
a. were "invented" by Galileo (as an astronomical
tool) b. gather electromagnetic radiation
c. magnify d. allow us to resolve distant
sources of light e. all the above apply
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