ASTRO 5 MIDTERM EXAM ACCURATE
QUESTIONS WITH CORRECT ANSWERS
200 QUESTIONS & ANSWERS
How old is the universe? - ANSWER 13.7 billion years old
When was the beginning of the universe? - ANSWER The Big Bang
Is the universe still expanding? - ANSWER yes
How many light years in radius is the observable Universe? - ANSWER 47
billion light years
What is the evidence for a spherical Earth? - ANSWER 1. the lunar eclipse
2. constellations
3. observation
4. high altitudes
why is the lunar eclipse evidence for a spherical Earth? - ANSWER shadow on
Moon from the Sun hitting the earth
why are the constellation evidence for a spherical Earth? - ANSWER you
would see the same stars if the Earth was flat vs. seeing different constellations
when it is round
what is light? - ANSWER it is an electromagnetic radiation, a propagating form
of eneergy that moves at a constant speed (the speed of light)
what is fundamental to cosmology, astronomy and physics in general? -
ANSWER light
In astronomy, almost all information we receive about the Universe, comes
from what? - ANSWER comes in the form of light
,light as a wave is not localized or localized? - ANSWER it is not localized but
instead traveling
light as a particle is not localized or localized? - ANSWER localized
what is a photon? - ANSWER our detailed physical theories (electromagnetism
and quantum mechanics) inform us that we can think of light either as a wave or
as a particle
what are "wave-particles duality"? - ANSWER is the concept that every
elementary particle or quantic entity may be partly described in terms not only
of particles, but also of waves.
what do you call the distance between the troughs or crest? - ANSWER
wavelength
do light waves stand still? - ANSWER no, they move with a constant speed
what is the constant speed of light? - ANSWER ~186,00 miles/sec
What travels faster than the speed of light? - ANSWER NOTHING, it is the
fastest
what is the rate of crest passing per second? - ANSWER "frequency" of the
light
what is a Hertz? - ANSWER it is frequency having units of 1/second.
Commonly abbreviate frequency with the Greek letter V
what is the equation for the speed of light - ANSWER frequency x wavelength
= speed of light
wavelength _______ and _____ out that light - ANSWER expands and
stretches
what is "visible light"? - ANSWER the colors only our eyes can see; the
wavelength if visible light controls its color.
, does red light have a relatively long or short wavelength? - ANSWER long
wavelength
does blue light have a relatively long or short wavelength? - ANSWER short
wavelength
what is the wavelength of visible light? - ANSWER less than one millionth of a
meter (1 micron) or about 4x10 ^(-5) inches
how many microns is blue light? - ANSWER ~0.4 micron
how many microns is green light? - ANSWER ~0.5 microns
how many microns is red light? - ANSWER ~0.6 microns
how many meters are radio waves? - ANSWER > 1 meter
how many meters are x-rays? - ANSWER < 10 ^(-10)
does light carry energy? - ANSWER yes
long wavelength= ? - ANSWER low energy and low frequency
short wavelength= ? - ANSWER high energy and high frequency
how do light waves interfere with one another? - ANSWER A+B & A,B
when does frequency and wavelength interfere? - ANSWER they interfere with
each other when they have the SAME frequency and SAME wavelength
what is an example of constructive interference? - ANSWER lasers
what is a constructive interference? - ANSWER where lightwaves are
generated in phase to amplify the power emitted at a single frequency
(wavelengths overlap so its boost the light)
QUESTIONS WITH CORRECT ANSWERS
200 QUESTIONS & ANSWERS
How old is the universe? - ANSWER 13.7 billion years old
When was the beginning of the universe? - ANSWER The Big Bang
Is the universe still expanding? - ANSWER yes
How many light years in radius is the observable Universe? - ANSWER 47
billion light years
What is the evidence for a spherical Earth? - ANSWER 1. the lunar eclipse
2. constellations
3. observation
4. high altitudes
why is the lunar eclipse evidence for a spherical Earth? - ANSWER shadow on
Moon from the Sun hitting the earth
why are the constellation evidence for a spherical Earth? - ANSWER you
would see the same stars if the Earth was flat vs. seeing different constellations
when it is round
what is light? - ANSWER it is an electromagnetic radiation, a propagating form
of eneergy that moves at a constant speed (the speed of light)
what is fundamental to cosmology, astronomy and physics in general? -
ANSWER light
In astronomy, almost all information we receive about the Universe, comes
from what? - ANSWER comes in the form of light
,light as a wave is not localized or localized? - ANSWER it is not localized but
instead traveling
light as a particle is not localized or localized? - ANSWER localized
what is a photon? - ANSWER our detailed physical theories (electromagnetism
and quantum mechanics) inform us that we can think of light either as a wave or
as a particle
what are "wave-particles duality"? - ANSWER is the concept that every
elementary particle or quantic entity may be partly described in terms not only
of particles, but also of waves.
what do you call the distance between the troughs or crest? - ANSWER
wavelength
do light waves stand still? - ANSWER no, they move with a constant speed
what is the constant speed of light? - ANSWER ~186,00 miles/sec
What travels faster than the speed of light? - ANSWER NOTHING, it is the
fastest
what is the rate of crest passing per second? - ANSWER "frequency" of the
light
what is a Hertz? - ANSWER it is frequency having units of 1/second.
Commonly abbreviate frequency with the Greek letter V
what is the equation for the speed of light - ANSWER frequency x wavelength
= speed of light
wavelength _______ and _____ out that light - ANSWER expands and
stretches
what is "visible light"? - ANSWER the colors only our eyes can see; the
wavelength if visible light controls its color.
, does red light have a relatively long or short wavelength? - ANSWER long
wavelength
does blue light have a relatively long or short wavelength? - ANSWER short
wavelength
what is the wavelength of visible light? - ANSWER less than one millionth of a
meter (1 micron) or about 4x10 ^(-5) inches
how many microns is blue light? - ANSWER ~0.4 micron
how many microns is green light? - ANSWER ~0.5 microns
how many microns is red light? - ANSWER ~0.6 microns
how many meters are radio waves? - ANSWER > 1 meter
how many meters are x-rays? - ANSWER < 10 ^(-10)
does light carry energy? - ANSWER yes
long wavelength= ? - ANSWER low energy and low frequency
short wavelength= ? - ANSWER high energy and high frequency
how do light waves interfere with one another? - ANSWER A+B & A,B
when does frequency and wavelength interfere? - ANSWER they interfere with
each other when they have the SAME frequency and SAME wavelength
what is an example of constructive interference? - ANSWER lasers
what is a constructive interference? - ANSWER where lightwaves are
generated in phase to amplify the power emitted at a single frequency
(wavelengths overlap so its boost the light)
