PHSC 106 - Exam Answers
__________ resists compression of the molecular cloud to form a star. - correct answer-All
of the available choices complete the sentence
(Rotation of the clouds, Magnetic Field lines exert forces on the particles in the cloud to,
Thermal Motion of atoms in the cloud, & Turbulence inside the cloud)
A ____________________ is a cool, dense cloud of dust and gas that is undergoing
gravitational contraction - correct answer-Protostar
A light year is ______________. - correct answer-the distance that light travels in 1 year
A neutral atom always contains - correct answer-the same number of protons as it does
electrons
A plot of the continuous spectra of five different stars is shown in the Figure. Based on these
spectra, which of the stars is the Bluest? - correct answer-Star A
A plot of the continuous spectra of five different stars is shown in the figure. Based on these
spectra, which of the stars is the COLDEST? - correct answer-Star E
A solar or lunar eclipse will occur - correct answer-when the sun is near the line of nodes of
the moon, and the moon is new or full
A star has a parallax angle of p=0.1 sec of an arc. How far away is the star in light years? -
correct answer-32.6
A star has a parallax angle of p=0.1 sec of an arc. How far away is the star in pc? - correct
answer-10
A star is 2 times the radius of the sun and its temperature is 2 times the suns temperature.
How many times more luminous is the star relative to the sun's luminosity? - correct
answer-64
A star would rise at 9:00 pm on a particular night. The next night you would expect to see the
star rise at - correct answer-8:56 pm
A totally eclipsed moon glows coppery red because - correct answer-only red light is able to
pass completely through Earth's atmosphere and reach the moon
According to the laws of thermal radiation, hotter objects emit photons with - correct
answer-a shorter average wavelength
, An eclipsing binary has been analyzed and it has been determined that the ratio of the mass
of star A to the mass of star B is 2 (MA/MB = 2) and the total mass of the two stars is 9 solar
masses (MA+MB = 9). What is the mass of star A in solar masses? - correct answer-6
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky.
If the illustration below depicts the photograph taken by the observer, which direction was
the camera pointing? - correct answer-straight north
An observer on Earth's geographic north pole would find - correct answer-Polaris directly
overhead
An ordinary glass lens forms an image by ____________ of light. - correct answer-refraction
As a star forms, the least massive stars contract toward the main sequence - correct
answer-slower than high mass stars
As an approximation, assume that Jupiter's orbit around the Sun is circular. The average
distance that Jupiter is from the sun is r = 778.5 ×109 m. The mass of the Sun is M =
1.989×1030 kg. What is the circular velocity vc of Jupiter orbiting the sun in m/s? Type in the
numerical answer only. No commas or units are necessary. - correct answer-13054.2
At the center of the Sun, fusion converts hydrogen into - correct answer-helium, energy, and
neutrinos
At what point in the light curve below is both stars visible? The y-axis in this plot is apparent
visual magnitude. - correct answer-1
At what point in the light curve below is the cooler star in front of the hotter star? The y-axis
in this plot is apparent visual magnitude - correct answer-4
At what wavelength (in nm) would a star radiate the greatest amount of energy if the star has
a surface temperature of 10,000 K? Only report the numerical answer. - correct answer-300
Based on the information in the table, what is the ratio of the intensity of Dra to that of Nim?
Type in the numerical answer only. No commas or units are necessary. - correct
answer-100.023
Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are -
correct answer-sharper
Elements such as Carbon come from the remains of stars. - correct answer-True
Galileo used a telescope to discover - correct answer-all of the choices
(spots on the sun, moons around Jupiter, craters on the moon, & moon-like phases of
Venus)
__________ resists compression of the molecular cloud to form a star. - correct answer-All
of the available choices complete the sentence
(Rotation of the clouds, Magnetic Field lines exert forces on the particles in the cloud to,
Thermal Motion of atoms in the cloud, & Turbulence inside the cloud)
A ____________________ is a cool, dense cloud of dust and gas that is undergoing
gravitational contraction - correct answer-Protostar
A light year is ______________. - correct answer-the distance that light travels in 1 year
A neutral atom always contains - correct answer-the same number of protons as it does
electrons
A plot of the continuous spectra of five different stars is shown in the Figure. Based on these
spectra, which of the stars is the Bluest? - correct answer-Star A
A plot of the continuous spectra of five different stars is shown in the figure. Based on these
spectra, which of the stars is the COLDEST? - correct answer-Star E
A solar or lunar eclipse will occur - correct answer-when the sun is near the line of nodes of
the moon, and the moon is new or full
A star has a parallax angle of p=0.1 sec of an arc. How far away is the star in light years? -
correct answer-32.6
A star has a parallax angle of p=0.1 sec of an arc. How far away is the star in pc? - correct
answer-10
A star is 2 times the radius of the sun and its temperature is 2 times the suns temperature.
How many times more luminous is the star relative to the sun's luminosity? - correct
answer-64
A star would rise at 9:00 pm on a particular night. The next night you would expect to see the
star rise at - correct answer-8:56 pm
A totally eclipsed moon glows coppery red because - correct answer-only red light is able to
pass completely through Earth's atmosphere and reach the moon
According to the laws of thermal radiation, hotter objects emit photons with - correct
answer-a shorter average wavelength
, An eclipsing binary has been analyzed and it has been determined that the ratio of the mass
of star A to the mass of star B is 2 (MA/MB = 2) and the total mass of the two stars is 9 solar
masses (MA+MB = 9). What is the mass of star A in solar masses? - correct answer-6
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky.
If the illustration below depicts the photograph taken by the observer, which direction was
the camera pointing? - correct answer-straight north
An observer on Earth's geographic north pole would find - correct answer-Polaris directly
overhead
An ordinary glass lens forms an image by ____________ of light. - correct answer-refraction
As a star forms, the least massive stars contract toward the main sequence - correct
answer-slower than high mass stars
As an approximation, assume that Jupiter's orbit around the Sun is circular. The average
distance that Jupiter is from the sun is r = 778.5 ×109 m. The mass of the Sun is M =
1.989×1030 kg. What is the circular velocity vc of Jupiter orbiting the sun in m/s? Type in the
numerical answer only. No commas or units are necessary. - correct answer-13054.2
At the center of the Sun, fusion converts hydrogen into - correct answer-helium, energy, and
neutrinos
At what point in the light curve below is both stars visible? The y-axis in this plot is apparent
visual magnitude. - correct answer-1
At what point in the light curve below is the cooler star in front of the hotter star? The y-axis
in this plot is apparent visual magnitude - correct answer-4
At what wavelength (in nm) would a star radiate the greatest amount of energy if the star has
a surface temperature of 10,000 K? Only report the numerical answer. - correct answer-300
Based on the information in the table, what is the ratio of the intensity of Dra to that of Nim?
Type in the numerical answer only. No commas or units are necessary. - correct
answer-100.023
Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are -
correct answer-sharper
Elements such as Carbon come from the remains of stars. - correct answer-True
Galileo used a telescope to discover - correct answer-all of the choices
(spots on the sun, moons around Jupiter, craters on the moon, & moon-like phases of
Venus)
