Question 1

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 
E) the electron loses mass 
A) the atom is ionized 
B) a continuous spectrum is emitted 
C) a photon is emitted 
D) a photon is absorbed 
E) the electron loses mass

Question 2

How are atoms excited and why do they decay?

Accepted Answer

An atom becomes excited when an electron

Question 3

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) Raise its temperature by a factor of 10. 
D) Lower its temperature by a factor of 2.6. 
E) 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) Raise its temperature by a factor of 10. 
D) Lower its temperature by a factor of 2.6. 
E) Lower its temperature by a factor of 5.4.

Question 4

At what wavelength does your body radiate the most given that your temperature is approximately that of the Earth,which is 300 K?

Accepted Answer

A) 10−5 m 
B) 10−3 m 
C) 10−2 m 
D) 10 m 
E) 1,000 m 
A) 10−5 m 
B) 10−3 m 
C) 10−2 m 
D) 10 m 
E) 1,000 m

Question 5

If an object is moving toward you,the light you see from it will be blueshifted.

Accepted Answer

A) True 
 B)False

Question 6

A light-year is a unit that is used to measure:

Accepted Answer

A) time 
B) wavelength 
C) speed 
D) energy 
E) distance 
A) time 
B) wavelength 
C) speed 
D) energy 
E) distance

Question 7

What wavelengths of light can the human eye see?

Accepted Answer

A) 3.8 μm to 7.5 μm 
B) 3.8 nm to 7.5 nm 
C) 380 cm to 750 cm 
D) 380 nm to 750 nm 
E) 3.8 m to 7.5 m 
A) 3.8 μm to 7.5 μm 
B) 3.8 nm to 7.5 nm 
C) 380 cm to 750 cm 
D) 380 nm to 750 nm 
E) 3.8 m to 7.5 m

Question 8

You observe a red star and a blue star and are able to determine that they are the same size.Which star is hotter,and which star is more luminous?

Accepted Answer

A) The red star is hotter and more luminous. 
B) The red star is hotter,and the blue star is more luminous. 
C) The blue star is hotter and more luminous. 
D) The blue star is hotter,and the red star is more luminous. 
E) They have the same luminosities and temperatures. 
A) The red star is hotter and more luminous. 
B) The red star is hotter,and the blue star is more luminous. 
C) The blue star is hotter and more luminous. 
D) The blue star is hotter,and the red star is more luminous. 
E) They have the same luminosities and temperatures.

Question 9

Which of the following lists different types of electromagnetic radiation in order from the smallest wavelength to the largest 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 10

The color of visible light is determined by its:

Accepted Answer

A) speed 
B) wavelength 
C) mass 
D) distance from you 
E) size 
A) speed 
B) wavelength 
C) mass 
D) distance from you 
E) size

Question 11

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

Accepted Answer

A) 5,000 km/s 
B) 500 km/s 
C) 50 km/s 
D) 5 km/s 
E) 0.5 km/s 
A) 5,000 km/s 
B) 500 km/s 
C) 50 km/s 
D) 5 km/s 
E) 0.5 km/s

Question 12

The Kelvin temperature scale is used in astronomy because:

Accepted Answer

A) at 0 K an object has absolutely zero energy 
B) water freezes at 0 K 
C) water boils at 100 K 
D) hydrogen freezes at 0 K 
E) the highest temperature possible is 1000 K 
A) at 0 K an object has absolutely zero energy 
B) water freezes at 0 K 
C) water boils at 100 K 
D) hydrogen freezes at 0 K 
E) the highest temperature possible is 1000 K

Question 13

The luminosity of an object is independent of its distance from you.

Accepted Answer

A) True 
 B)False

Question 14

As wavelength increases,the energy of a photon _________ and its frequency _________.

Accepted Answer

A) increases;decreases 
B) increases;increases 
C) decreases;decreases 
D) decreases;increases 
A) increases;decreases 
B) increases;increases 
C) decreases;decreases 
D) decreases;increases

Question 15

Imagine a satellite is orbiting a planet as shown in the image below.This satellite gives off radio waves with a constant wavelength of 1 meter.An observer on Earth then measures the signal from the satellite when it is at the locations labeled A-D.For each of these locations,how does the wavelength received compare to the wavelength that the satellite gave off?

Accepted Answer

A: Received signal will be exactly 1 met

Question 16

If you observe an isolated hot cloud of gas,you will see:

Accepted Answer

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

Question 17

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) 5.6 times farther 
E) 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) 5.6 times farther 
E) The red giants and main sequence stars have approximately the same distances.

Question 18

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) ultraviolet photons have less energy than visible photons 
E) 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) ultraviolet photons have less energy than visible photons 
E) all of the above are true

Question 19

-The difference in energy between the n = 2 and n = 1 electronic energy levels in the hydrogen atom is 1.6 × 10−18 J.If an electron moves from the n = 1 level to the n = 2 level,will a photon be emitted or absorbed? What will its energy be,and what type of electromagnetic radiation is it? Use the electromagnetic spectrum shown above to answer this question.

Accepted Answer

The n = 2 energy level is higher than th

Question 20

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

Accepted Answer

Red and blue photons both trav

Exam 5: Light

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

How are atoms excited and why do they decay?

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?

At what wavelength does your body radiate the most given that your temperature is approximately that of the Earth,which is 300 K?

If an object is moving toward you,the light you see from it will be blueshifted.

A light-year is a unit that is used to measure:

What wavelengths of light can the human eye see?

You observe a red star and a blue star and are able to determine that they are the same size.Which star is hotter,and which star is more luminous?

Which of the following lists different types of electromagnetic radiation in order from the smallest wavelength to the largest wavelength?

The color of visible light is determined by its:

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

The Kelvin temperature scale is used in astronomy because:

The luminosity of an object is independent of its distance from you.

As wavelength increases,the energy of a photon _________ and its frequency _________.

If you observe an isolated hot cloud of gas,you will see:

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?

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

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

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

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 Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

As wavelength increases,the energy of a photon _ and its frequency _.