Question 1

Which of the following factors does NOT directly influence the temperature of a planet?

Accepted Answer

A)  The luminosity of the Sun 
B)  The distance of the planet from the Sun 
C)  The albedo of the planet 
D)  The size of the planet 
A)  The luminosity of the Sun 
B)  The distance of the planet from the Sun 
C)  The albedo of the planet 
D)  The size of the planet

Question 2

The light-year is a unit of

Accepted Answer

A)  time. 
B)  distance. 
C)  speed. 
D)  energy. 
A)  time. 
B)  distance. 
C)  speed. 
D)  energy.

Question 3

For a star that lies in the plane of Earth's orbit around the Sun,how does the observed wavelength of the hydrogen absorption line at 656.28 nm in its spectrum change in wavelength (if at all)with the time of year?

Accepted Answer

The wavelength of this absorption line w

Question 4

Which of the following lists different types of electromagnetic radiation in order of increasing wavelength?

Accepted Answer

A)  Radio waves,infrared,visible,ultraviolet,X-rays 
B)  Gamma rays,ultraviolet,visible,infrared,radio waves 
C)  Gamma rays,X-rays,infrared,visible,ultraviolet 
D)  X-rays,infrared,visible,ultraviolet,radio waves 
E)  Radio waves,ultraviolet,visible,infrared,gamma rays 
A)  Radio waves,infrared,visible,ultraviolet,X-rays 
B)  Gamma rays,ultraviolet,visible,infrared,radio waves 
C)  Gamma rays,X-rays,infrared,visible,ultraviolet 
D)  X-rays,infrared,visible,ultraviolet,radio waves 
E)  Radio waves,ultraviolet,visible,infrared,gamma rays

Question 5

It is possible for light to travel slower than 300,000 km/s.

Accepted Answer

A) True 
 B)False

Question 6

A thin cloud of cool gas on top of hotter blackbody will radiate an emission spectrum.

Accepted Answer

A) True 
 B)False

Question 7

How are atoms excited and why do they decay?

Accepted Answer

An atom becomes excited when an electron

Question 8

A black car left in the sunlight becomes hotter than a white car left in the sunlight under the same conditions because

Accepted Answer

A)  the white car absorbs more sunlight than the black car. 
B)  the white car reflects more sunlight than the black car. 
C)  the black car absorbs only blue photons and reflects red photons,whereas the white car absorbs only red photons and reflects blue photons. 
D)  the atoms in the black car are smaller than the atoms in the white car. 
A)  the white car absorbs more sunlight than the black car. 
B)  the white car reflects more sunlight than the black car. 
C)  the black car absorbs only blue photons and reflects red photons,whereas the white car absorbs only red photons and reflects blue photons. 
D)  the atoms in the black car are smaller than the atoms in the white car.

Question 9

A nebula emits

Accepted Answer

A)  an absorption spectrum. 
B)  a continuous spectrum. 
C)  an emission spectrum. 
D)  a rainbow spectrum. 
A)  an absorption spectrum. 
B)  a continuous spectrum. 
C)  an emission spectrum. 
D)  a rainbow spectrum.

Question 10

You are driving on the freeway when a police officer records a shift of -7 nm when he hits you with a radar gun that operates at a wavelength of 0.1 m.How fast were you going?

Accepted Answer

A)  47 mph 
B)  83 mph 
C)  21 mph 
D)  65 mph 
A)  47 mph 
B)  83 mph 
C)  21 mph 
D)  65 mph

Question 11

When an electron moves from a higher energy level in an atom to a lower energy level,

Accepted Answer

A)  the atom is ionized. 
B)  a continuous spectrum is emitted. 
C)  a photon is emitted. 
D)  a photon is absorbed. 
A)  the atom is ionized. 
B)  a continuous spectrum is emitted. 
C)  a photon is emitted. 
D)  a photon is absorbed.

Question 12

Compare two blackbody objects,one at 200 K and one at 400 K.How much larger is the flux from the 400 K object,compared to the flux from the 200 K object?

Accepted Answer

A)  Twice as much 
B)  Four times as much 
C)  Eight times as much 
D)  Sixteen times as much 
A)  Twice as much 
B)  Four times as much 
C)  Eight times as much 
D)  Sixteen times as much

Question 13

What two factors control a planet's temperature?

Accepted Answer

A planet's distance

Question 14

Cooler objects radiate more of their total light at shorter wavelengths than hotter objects.

Accepted Answer

A) True 
 B)False

Question 15

At what temperature does water freeze?

Accepted Answer

A)  0 K 
B)  32 K 
C)  100 K 
D)  273 K 
E)  373 K 
A)  0 K 
B)  32 K 
C)  100 K 
D)  273 K 
E)  373 K

Question 16

Which formula denotes how the speed of light is related to its wavelength and frequency?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 17

As a blackbody becomes hotter,it also becomes __________ and __________.

Accepted Answer

A)  more luminous;redder 
B)  more luminous;bluer 
C)  less luminous;redder 
D)  less luminous;bluer 
A)  more luminous;redder 
B)  more luminous;bluer 
C)  less luminous;redder 
D)  less luminous;bluer

Question 18

The energy of a proton is inversely proportional to its wavelength.

Accepted Answer

A) True 
 B)False

Question 19

Star A emits a continuous spectrum of light that peaks at a wavelength of 450 nm.Star B emits a continuous spectrum of light that peaks at a wavelength of 700 nm.What is the ratio of the temperature of star A to star B if the emissions from both stars follow Wien's law?

Accepted Answer

In Wien's law,temper

Question 20

Consider an incandescent light bulb.If you wanted to turn a 10 W light bulb into a 100 W light bulb,how would you change the temperature of the filament inside the bulb?

Accepted Answer

A)  Raise its temperature by a factor of 3.2 
B)  Raise its temperature by a factor of 1.8 
C)  Lower its temperature by a factor of 2.6 
D)  Lower its temperature by a factor of 5.4 
A)  Raise its temperature by a factor of 3.2 
B)  Raise its temperature by a factor of 1.8 
C)  Lower its temperature by a factor of 2.6 
D)  Lower its temperature by a factor of 5.4

Exam 4: Light

Which of the following factors does NOT directly influence the temperature of a planet?

The light-year is a unit of

For a star that lies in the plane of Earth's orbit around the Sun,how does the observed wavelength of the hydrogen absorption line at 656.28 nm in its spectrum change in wavelength (if at all)with the time of year?

Which of the following lists different types of electromagnetic radiation in order of increasing wavelength?

It is possible for light to travel slower than 300,000 km/s.

A thin cloud of cool gas on top of hotter blackbody will radiate an emission spectrum.

How are atoms excited and why do they decay?

A black car left in the sunlight becomes hotter than a white car left in the sunlight under the same conditions because

A nebula emits

You are driving on the freeway when a police officer records a shift of -7 nm when he hits you with a radar gun that operates at a wavelength of 0.1 m.How fast were you going?

When an electron moves from a higher energy level in an atom to a lower energy level,

Compare two blackbody objects,one at 200 K and one at 400 K.How much larger is the flux from the 400 K object,compared to the flux from the 200 K object?

What two factors control a planet's temperature?

Cooler objects radiate more of their total light at shorter wavelengths than hotter objects.

At what temperature does water freeze?

Which formula denotes how the speed of light is related to its wavelength and frequency?

As a blackbody becomes hotter,it also becomes __________ and __________.

The energy of a proton is inversely proportional to its wavelength.

Star A emits a continuous spectrum of light that peaks at a wavelength of 450 nm.Star B emits a continuous spectrum of light that peaks at a wavelength of 700 nm.What is the ratio of the temperature of star A to star B if the emissions from both stars follow Wien's law?

Consider an incandescent light bulb.If you wanted to turn a 10 W light bulb into a 100 W light bulb,how would you change the temperature of the filament inside the bulb?

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

As a blackbody becomes hotter,it also becomes and .