Question 1

How much would you have to change the temperature of an object if you wanted to increase its flux by a factor of 100?

Accepted Answer

Because flux is prop

Question 2

A hotter star will radiate more blue photons than a cooler star.

Accepted Answer

A) True 
 B)False

Question 3

In the quantum mechanical view of the atom,an electron is best thought of as

Accepted Answer

A)  a cloud that is centered on the nucleus. 
B)  a pointlike particle orbiting the nucleus. 
C)  free to orbit at any distance from the nucleus. 
D)  All of the above are true. 
A)  a cloud that is centered on the nucleus. 
B)  a pointlike particle orbiting the nucleus. 
C)  free to orbit at any distance from the nucleus. 
D)  All of the above are true.

Question 4

The speed of light was first determined by which scientist?

Accepted Answer

A)  Galileo 
B)  Rømer 
C)  Kepler 
D)  Newton 
E)  Einstein 
A)  Galileo 
B)  Rømer 
C)  Kepler 
D)  Newton 
E)  Einstein

Question 5

If the wavelength of a beam of light were to double,how would that affect its frequency?

Accepted Answer

A)  The frequency would be four times larger. 
B)  The frequency would be two times larger. 
C)  The frequency would be two times smaller 
D)  The frequency would be four times smaller. 
E)  There is no relationship between wavelength and frequency. 
A)  The frequency would be four times larger. 
B)  The frequency would be two times larger. 
C)  The frequency would be two times smaller 
D)  The frequency would be four times smaller. 
E)  There is no relationship between wavelength and frequency.

Question 6

A radio photon travels more slowly than a gamma ray photon.

Accepted Answer

A) True 
 B)False

Question 7

The average red giant in the night sky is about 1,000 times more luminous than the average main-sequence star.If both kinds of stars have about the same brightness,how much farther away are the red giants compared to the main-sequence stars?

Accepted Answer

A)  32 times farther 
B)  1,000 times farther 
C)  65 times farther 
D)  The red giants and main sequence stars have approximately the same distances. 
A)  32 times farther 
B)  1,000 times farther 
C)  65 times farther 
D)  The red giants and main sequence stars have approximately the same distances.

Question 8

A spaceship approaches Earth at 0.9 times the speed of light and shines a powerful searchlight onto Earth.How fast will the photons from this searchlight be moving when they hit Earth?

Accepted Answer

At the spe

Question 9

An emission line is produced when an atom absorbs a photon of a specific energy.

Accepted Answer

A) True 
 B)False

Question 10

Compare and contrast the wavelengths,frequencies,speeds,and energies of red and blue photons.

Accepted Answer

Red and blue photons both trav

Question 11

The difference in energy between the   and   electronic energy levels in the hydrogen atom is   .If an electron moves from the   level to the   level will a photon be emitted or absorbed? What will its energy be,and what type of electromagnetic radiation is it?

Accepted Answer

The @#IMG-DLM& energy level is higher th

Question 12

You record the spectrum of a star and find that the calcium absorption line,whose rest wavelength is 393.3 nm,has an observed wavelength of 394.0 nm.What is the radial velocity of this star?

Accepted Answer

A)  500 km/s 
B)  50 km/s 
C)  5 km/s 
D)  0.5 km/s 
A)  500 km/s 
B)  50 km/s 
C)  5 km/s 
D)  0.5 km/s

Question 13

The fact that the speed of light is constant (as it travels through a vacuum)means that

Accepted Answer

A)  photons with longer wavelengths have lower frequencies. 
B)  radio wave photons have shorter wavelengths than gamma ray photons. 
C)  X-rays can be transmitted through the atmosphere around the world. 
D)  All of the above are true. 
A)  photons with longer wavelengths have lower frequencies. 
B)  radio wave photons have shorter wavelengths than gamma ray photons. 
C)  X-rays can be transmitted through the atmosphere around the world. 
D)  All of the above are true.

Question 14

The total number of neutrons and protons define an atom's atomic mass and determine the type of chemical element it is.

Accepted Answer

A) True 
 B)False

Question 15

The period of a wave is inversely proportional to the frequency of the wave.

Accepted Answer

A) True 
 B)False

Question 16

The reason that Earth is hotter than Jupiter is because the Earth is smaller than Jupiter.

Accepted Answer

A) True 
 B)False

Question 17

How does the speed of light traveling through a medium (such as air or glass)compare to the speed of light in a vacuum?

Accepted Answer

A)  It is the same as the speed of light in a vacuum. 
B)  It is always less than the speed of light in a vacuum. 
C)  It is always greater than the speed of light in a vacuum. 
D)  Sometimes it is greater than the speed of light in a vacuum,and sometimes it is less,depending on the medium. 
A)  It is the same as the speed of light in a vacuum. 
B)  It is always less than the speed of light in a vacuum. 
C)  It is always greater than the speed of light in a vacuum. 
D)  Sometimes it is greater than the speed of light in a vacuum,and sometimes it is less,depending on the medium.

Question 18

The Doppler shift can be used to determine the __________ of an object.

Accepted Answer

A)  energy 
B)  temperature 
C)  radial velocity 
D)  no radiation 
A)  energy 
B)  temperature 
C)  radial velocity 
D)  no radiation

Question 19

Why do we see black lines in an absorption spectrum if the absorbed photons are (almost)instantaneously reemitted by the atoms in the cloud?

Accepted Answer

Originally all the light was traveling i

Question 20

Which of the following photons carry the least amount of energy?

Accepted Answer

A)  a blue photon of the visible spectrum,whose wavelength is 450 nm 
B)  an infrared photon,whose wavelength is   
C)  a red photon in the visible spectrum,whose wavelength is 700 nm 
D)  a microwave photon,whose wavelength is   
A)  a blue photon of the visible spectrum,whose wavelength is 450 nm 
B)  an infrared photon,whose wavelength is   
C)  a red photon in the visible spectrum,whose wavelength is 700 nm 
D)  a microwave photon,whose wavelength is

Exam 4: Light

How much would you have to change the temperature of an object if you wanted to increase its flux by a factor of 100?

A hotter star will radiate more blue photons than a cooler star.

In the quantum mechanical view of the atom,an electron is best thought of as

The speed of light was first determined by which scientist?

If the wavelength of a beam of light were to double,how would that affect its frequency?

A radio photon travels more slowly than a gamma ray photon.

The average red giant in the night sky is about 1,000 times more luminous than the average main-sequence star.If both kinds of stars have about the same brightness,how much farther away are the red giants compared to the main-sequence stars?

A spaceship approaches Earth at 0.9 times the speed of light and shines a powerful searchlight onto Earth.How fast will the photons from this searchlight be moving when they hit Earth?

An emission line is produced when an atom absorbs a photon of a specific energy.

Compare and contrast the wavelengths,frequencies,speeds,and energies of red and blue photons.

The difference in energy between the and electronic energy levels in the hydrogen atom is .If an electron moves from the level to the level will a photon be emitted or absorbed? What will its energy be,and what type of electromagnetic radiation is it?

You record the spectrum of a star and find that the calcium absorption line,whose rest wavelength is 393.3 nm,has an observed wavelength of 394.0 nm.What is the radial velocity of this star?

The fact that the speed of light is constant (as it travels through a vacuum)means that

The total number of neutrons and protons define an atom's atomic mass and determine the type of chemical element it is.

The period of a wave is inversely proportional to the frequency of the wave.

The reason that Earth is hotter than Jupiter is because the Earth is smaller than Jupiter.

How does the speed of light traveling through a medium (such as air or glass)compare to the speed of light in a vacuum?

The Doppler shift can be used to determine the __________ of an object.

Why do we see black lines in an absorption spectrum if the absorbed photons are (almost)instantaneously reemitted by the atoms in the cloud?

Which of the following photons carry the least amount of energy?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Stars in the Slow Lanelow-Mass Stellar Evolution

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

Filters