Question 1

When an atom loses an electron, it becomes

Accepted Answer

A) sublimated. 
B) a plasma. 
C) dissociated. 
D) an isotope. 
E) ionized. 
A) sublimated. 
B) a plasma. 
C) dissociated. 
D) an isotope. 
E) ionized.

Question 2

Cell phone signals passing through walls is an example of

Accepted Answer

A) emission. 
B) transmission. 
C) absorption. 
D) reflection or scattering. 
A) emission. 
B) transmission. 
C) absorption. 
D) reflection or scattering.

Question 3

Division of the EM Spectrum: The electromagnetic spectrum is divided into several parts that go by different names: radio waves, microwaves, infrared radiation, visible light, ultraviolet light, X- rays and Gamma- rays. However, we know that all are examples of the same phenomena, namely electromagnetic radiation. Why do you think these names were introduced in the first place? Research at your library or on reputable Internet sites. Does retaining these names serve any useful purpose today?

Accepted Answer

The names for the divisions of the elect

Question 4

Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How would the thermal radiation spectrum of the Sun be different?

Accepted Answer

The higher temperature of the Sun would

Question 5

Atomic nuclei consist of protons and electrons.

Accepted Answer

A) True 
 B)False

Question 6

Any object moving relative to Earth will have a Doppler shift when viewed from Earth.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following statements about electrons is not true?

Accepted Answer

A) Electrons orbit the nucleus rather like planets orbiting the Sun. 
B) An electron has a negative electrical charge. 
C) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. 
D) Electrons have very little mass compared to protons or neutrons. 
E) Within an atom, an electron can have only particular energies. 
A) Electrons orbit the nucleus rather like planets orbiting the Sun. 
B) An electron has a negative electrical charge. 
C) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. 
D) Electrons have very little mass compared to protons or neutrons. 
E) Within an atom, an electron can have only particular energies.

Question 8

The most common isotope of uranium is U- 238, but the form used in nuclear bombs and nuclear power plants is U- 235. Given that uranium has atomic number 92, how many neutrons are in each of these two isotopes?

Accepted Answer

U- 238 has 146 neutr

Question 9

How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?

Accepted Answer

A) It releases a photon equal in energy to its own energy drop. 
B) It loses gravitational potential energy. 
C) It absorbs a photon equal in energy to its own energy drop. 
D) It exchanges gravitational potential energy for kinetic energy. 
E) It loses kinetic energy. 
A) It releases a photon equal in energy to its own energy drop. 
B) It loses gravitational potential energy. 
C) It absorbs a photon equal in energy to its own energy drop. 
D) It exchanges gravitational potential energy for kinetic energy. 
E) It loses kinetic energy.

Question 10

We can see each other in the classroom right now because we

Accepted Answer

A) reflect visible light. 
B) emit thermal radiation. 
C) emit visible light. 
D) emit infrared light. 
E) reflect infrared light. 
A) reflect visible light. 
B) emit thermal radiation. 
C) emit visible light. 
D) emit infrared light. 
E) reflect infrared light.

Question 11

Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?

Accepted Answer

A) atomic number = 6; atomic mass number = 13 
B) atomic number = 6; atomic mass number = 7 
C) atomic number = 7; atomic mass number = 13 
D) atomic number = 13; atomic mass number = 6 
A) atomic number = 6; atomic mass number = 13 
B) atomic number = 6; atomic mass number = 7 
C) atomic number = 7; atomic mass number = 13 
D) atomic number = 13; atomic mass number = 6

Question 12

Explain how adaptive optics works.

Accepted Answer

Adaptive optics corrects for atmospheric

Question 13

Compared to the size of its nucleus, the size of an atom is about

Accepted Answer

A) the same. 
B) one hundred thousand times greater. 
C) ten times greater. 
D) a thousand times greater. 
E) a hundred times greater. 
A) the same. 
B) one hundred thousand times greater. 
C) ten times greater. 
D) a thousand times greater. 
E) a hundred times greater.

Question 14

The energy levels for electrons vary from one element to another.

Accepted Answer

A) True 
 B)False

Question 15

Electrons orbit an atomic nucleus like planets orbit the Sun.

Accepted Answer

A) True 
 B)False

Question 16

Everything looks red through a red filter because

Accepted Answer

A) the filter reflects red light and transmits other colors. 
B) the filter absorbs red light and emits other colors. 
C) the filter emits red light and absorbs other colors. 
D) the filter transmits red light and absorbs other colors. 
A) the filter reflects red light and transmits other colors. 
B) the filter absorbs red light and emits other colors. 
C) the filter emits red light and absorbs other colors. 
D) the filter transmits red light and absorbs other colors.

Question 17

The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through

Accepted Answer

A) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. 
B) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy. 
C) The electron jumps to level 3 as soon as it absorbs any additional energy. 
D) A different electron drops into level 1, since it is now unoccupied. 
E) represent an electron moving between energy levels. Suppose that an electron in a hydrogen atom absorbs 10.2 eV of energy, so that it moves from level 1 to level 2. What typically happens next? 
A) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. 
B) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy. 
C) The electron jumps to level 3 as soon as it absorbs any additional energy. 
D) A different electron drops into level 1, since it is now unoccupied. 
E) represent an electron moving between energy levels. Suppose that an electron in a hydrogen atom absorbs 10.2 eV of energy, so that it moves from level 1 to level 2. What typically happens next?

Question 18

Which of the following statements about X- rays and radio waves is not true?

Accepted Answer

A) Neither X- rays nor radio waves can penetrate Earth's atmosphere. 
B) X- rays have higher energy than radio waves. 
C) X- rays and radio waves are both forms of light, or electromagnetic radiation. 
D) X- rays have shorter wavelengths than radio waves. 
E) X- rays have higher frequency than radio waves. 
A) Neither X- rays nor radio waves can penetrate Earth's atmosphere. 
B) X- rays have higher energy than radio waves. 
C) X- rays and radio waves are both forms of light, or electromagnetic radiation. 
D) X- rays have shorter wavelengths than radio waves. 
E) X- rays have higher frequency than radio waves.

Question 19

Which of the following statements about thermal radiation is always true?

Accepted Answer

A) All the light emitted by hot object has higher energy than the light emitted by a cooler object. 
B) A hot object emits more radiation per unit surface area than a cool object. 
C) A hot object produces more total infrared emission than a cooler object. 
D) A cold object produces more total infrared and radio emission per unit surface area than a hot object. 
A) All the light emitted by hot object has higher energy than the light emitted by a cooler object. 
B) A hot object emits more radiation per unit surface area than a cool object. 
C) A hot object produces more total infrared emission than a cooler object. 
D) A cold object produces more total infrared and radio emission per unit surface area than a hot object.

Question 20

The atomic nuclei of the same element always have the same number of protons.

Accepted Answer

A) True 
 B)False

When an atom loses an electron, it becomes

Cell phone signals passing through walls is an example of

Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How would the thermal radiation spectrum of the Sun be different?

Atomic nuclei consist of protons and electrons.

Any object moving relative to Earth will have a Doppler shift when viewed from Earth.

Which of the following statements about electrons is not true?

The most common isotope of uranium is U- 238, but the form used in nuclear bombs and nuclear power plants is U- 235. Given that uranium has atomic number 92, how many neutrons are in each of these two isotopes?

How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?

We can see each other in the classroom right now because we

Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?

Explain how adaptive optics works.

Compared to the size of its nucleus, the size of an atom is about

The energy levels for electrons vary from one element to another.

Electrons orbit an atomic nucleus like planets orbit the Sun.

Everything looks red through a red filter because

The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through

Which of the following statements about X- rays and radio waves is not true?

Which of the following statements about thermal radiation is always true?

The atomic nuclei of the same element always have the same number of protons.

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Filters

Exam 5: Light: the Cosmic Messenger

When an atom loses an electron, it becomes

Cell phone signals passing through walls is an example of

Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How would the thermal radiation spectrum of the Sun be different?

Atomic nuclei consist of protons and electrons.

Any object moving relative to Earth will have a Doppler shift when viewed from Earth.

Which of the following statements about electrons is not true?

The most common isotope of uranium is U- 238, but the form used in nuclear bombs and nuclear power plants is U- 235. Given that uranium has atomic number 92, how many neutrons are in each of these two isotopes?

How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?

We can see each other in the classroom right now because we

Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?

Explain how adaptive optics works.

Compared to the size of its nucleus, the size of an atom is about

The energy levels for electrons vary from one element to another.

Electrons orbit an atomic nucleus like planets orbit the Sun.

Everything looks red through a red filter because

The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through

Which of the following statements about X- rays and radio waves is not true?

Which of the following statements about thermal radiation is always true?

The atomic nuclei of the same element always have the same number of protons.

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Filters