Question 1

Planck's constant is 6.6 * 10-34 J·s and the electron mass is 9.1 * 10-31 kg.The de Broglie wavelength of an electron whose speed is 2.0 * 107 m/s is

Accepted Answer

A) 2.8 * 10-10 m. 
B) 3.6 * 10-10 m. 
C) 3.6 * 10-11 m. 
D) 2.8 * 1010 m. 
A) 2.8 * 10-10 m. 
B) 3.6 * 10-10 m. 
C) 3.6 * 10-11 m. 
D) 2.8 * 1010 m. C

Question 2

A photon is emitted by an atom when one of the atom's electrons

Accepted Answer

A) leaves the atom. 
B) collides with another of its electrons. 
C) shifts to a lower energy level. 
D) shifts to a higher energy level. 
A) leaves the atom. 
B) collides with another of its electrons. 
C) shifts to a lower energy level. 
D) shifts to a higher energy level. C

Question 3

The light waves from a laser

Accepted Answer

A) have different wavelengths. 
B) have different speeds. 
C) are in step with one another. 
D) spread out to form a wide beam. 
A) have different wavelengths. 
B) have different speeds. 
C) are in step with one another. 
D) spread out to form a wide beam. C

Question 4

The speed of a photon

Accepted Answer

A) is less than the speed of light. 
B) is equal to the speed of light. 
C) is greater than the speed of light. 
D) Any of these choices could be correct, depending on its frequency. 
A) is less than the speed of light. 
B) is equal to the speed of light. 
C) is greater than the speed of light. 
D) Any of these choices could be correct, depending on its frequency.

Question 5

A moving body is described by its wave function   at a certain time and place.The value of   is proportional to the body's

Accepted Answer

A) electric field. 
B) speed. 
C) energy. 
D) probability of being found. 
A) electric field. 
B) speed. 
C) energy. 
D) probability of being found.

Question 6

Photons have

Accepted Answer

A) no charge. 
B) charges smaller than $\pm$e, like quarks. 
C) charges of $\pm$e. 
D) charges whose magnitudes depends on their speeds. 
A) no charge. 
B) charges smaller than $\pm$e, like quarks. 
C) charges of $\pm$e. 
D) charges whose magnitudes depends on their speeds.

Question 7

Which of the following electron jumps in a hydrogen atom emits the photon of lowest frequency?

Accepted Answer

A) n = 1 to n = 2 
B) n = 2 to n = 1 
C) n = 2 to n = 3 
D) n = 3 to n = 2 
A) n = 1 to n = 2 
B) n = 2 to n = 1 
C) n = 2 to n = 3 
D) n = 3 to n = 2

Question 8

The photoelectric effect occurs only when the incident light has more than a certain minimum

Accepted Answer

A) frequency. 
B) wavelength. 
C) speed. 
D) charge. 
A) frequency. 
B) wavelength. 
C) speed. 
D) charge.

Question 9

If Planck's constant were larger than it is,

Accepted Answer

A) moving bodies would have longer wavelengths. 
B) moving bodies would have smaller energies. 
C) moving bodies would have higher speeds. 
D) the uncertainty principle would be more significant. 
A) moving bodies would have longer wavelengths. 
B) moving bodies would have smaller energies. 
C) moving bodies would have higher speeds. 
D) the uncertainty principle would be more significant.

Question 10

Planck's constant is h = 6.6 * 10-34 J·s.The energy of a photon of light whose frequency is 3 * 1014 Hz is

Accepted Answer

A) 2.2 * 10-48 J. 
B) 1.98 * 10-47 J. 
C) 1.98 * 10-19 J. 
D) 4.5 * 1019 J. 
A) 2.2 * 10-48 J. 
B) 1.98 * 10-47 J. 
C) 1.98 * 10-19 J. 
D) 4.5 * 1019 J.

Question 11

Electrons

Accepted Answer

A) have no magnetic properties. 
B) have the same magnetic behavior as particles of iron. 
C) behave like tiny bar magnets of different strengths. 
D) behave like tiny bar magnets of the same strength. 
A) have no magnetic properties. 
B) have the same magnetic behavior as particles of iron. 
C) behave like tiny bar magnets of different strengths. 
D) behave like tiny bar magnets of the same strength.

Question 12

The idea that light has both wave and particle properties is accepted because

Accepted Answer

A) theory and experiment agree. 
B) it is in accord with common sense. 
C) it was revealed to Einstein in a dream. 
D) photons have actually been seen. 
A) theory and experiment agree. 
B) it is in accord with common sense. 
C) it was revealed to Einstein in a dream. 
D) photons have actually been seen.

Question 13

In an emission spectral series, the

Accepted Answer

A) lines are evenly spaced. 
B) excited electrons all started from the same energy level. 
C) excited electrons all return to the same energy level. 
D) excited electrons leave the atoms. 
A) lines are evenly spaced. 
B) excited electrons all started from the same energy level. 
C) excited electrons all return to the same energy level. 
D) excited electrons leave the atoms.

Question 14

When light is directed at a metal surface, the emitted electrons

Accepted Answer

A) are called photons. 
B) have random energies. 
C) have energies that depend upon the intensity of the light. 
D) have energies that depend upon the frequency of the light. 
A) are called photons. 
B) have random energies. 
C) have energies that depend upon the intensity of the light. 
D) have energies that depend upon the frequency of the light.

Question 15

A proton and an electron have the same de Broglie wavelength.

Accepted Answer

A) The electron has the higher speed. 
B) The proton has the higher speed. 
C) They have the same speed. 
D) Any of the choices is true, depending on the wavelength. 
A) The electron has the higher speed. 
B) The proton has the higher speed. 
C) They have the same speed. 
D) Any of the choices is true, depending on the wavelength.

Question 16

X-rays are

Accepted Answer

A) electromagnetic waves of very short wavelength. 
B) electromagnetic waves of very long wavelength. 
C) matter waves of very short wavelength. 
D) matter waves of very long wavelength. 
A) electromagnetic waves of very short wavelength. 
B) electromagnetic waves of very long wavelength. 
C) matter waves of very short wavelength. 
D) matter waves of very long wavelength.

Question 17

An X-ray photon has an energy of 3.3 * 1015 J and Planck's constant is 6.6 * 10-34 J·s.The frequency that corresponds to this energy is

Accepted Answer

A) 3.3 * 10-50 Hz. 
B) 3 * 10-19 Hz. 
C) 3.3 * 1018 Hz. 
D) 3.3 * 1020 Hz. 
A) 3.3 * 10-50 Hz. 
B) 3 * 10-19 Hz. 
C) 3.3 * 1018 Hz. 
D) 3.3 * 1020 Hz.

Question 18

When a hydrogen atom is in its lowest energy level,

Accepted Answer

A) the de Broglie wavelength of its electron equals its orbit diameter. 
B) the de Broglie wavelength of its electron equals its orbit circumference. 
C) its electron has left the atom. 
D) its electron is at rest. 
A) the de Broglie wavelength of its electron equals its orbit diameter. 
B) the de Broglie wavelength of its electron equals its orbit circumference. 
C) its electron has left the atom. 
D) its electron is at rest.

Question 19

The speed of the wave packet that corresponds to a moving particle is

Accepted Answer

A) less than the speed of light. 
B) equal to the speed of light. 
C) greater than the speed of light. 
D) Any of these choices could be correct, depending on the frequency. 
A) less than the speed of light. 
B) equal to the speed of light. 
C) greater than the speed of light. 
D) Any of these choices could be correct, depending on the frequency.

Question 20

Classical physics cannot account for why

Accepted Answer

A) atoms can contain electrons. 
B) atomic electrons are in motion. 
C) atoms can emit electromagnetic waves. 
D) atoms can be stable. 
A) atoms can contain electrons. 
B) atomic electrons are in motion. 
C) atoms can emit electromagnetic waves. 
D) atoms can be stable.

Planck's constant is 6.6 * 10^-34 J·s and the electron mass is 9.1 * 10^-31 kg.The de Broglie wavelength of an electron whose speed is 2.0 * 10⁷ m/s is

A photon is emitted by an atom when one of the atom's electrons

The light waves from a laser

The speed of a photon

A moving body is described by its wave function at a certain time and place.The value of is proportional to the body's

Photons have

Which of the following electron jumps in a hydrogen atom emits the photon of lowest frequency?

The photoelectric effect occurs only when the incident light has more than a certain minimum

If Planck's constant were larger than it is,

Planck's constant is h = 6.6 * 10^-34 J·s.The energy of a photon of light whose frequency is 3 * 10¹⁴ Hz is

Electrons

The idea that light has both wave and particle properties is accepted because

In an emission spectral series, the

When light is directed at a metal surface, the emitted electrons

A proton and an electron have the same de Broglie wavelength.

X-rays are

An X-ray photon has an energy of 3.3 * 10¹⁵ J and Planck's constant is 6.6 * 10^-34 J·s.The frequency that corresponds to this energy is

When a hydrogen atom is in its lowest energy level,

The speed of the wave packet that corresponds to a moving particle is

Classical physics cannot account for why

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Exam 9: The Atom

Planck's constant is 6.6 * 10-34 J·s and the electron mass is 9.1 * 10-31 kg.The de Broglie wavelength of an electron whose speed is 2.0 * 107 m/s is

A photon is emitted by an atom when one of the atom's electrons

The light waves from a laser

The speed of a photon

A moving body is described by its wave function at a certain time and place.The value of is proportional to the body's

Photons have

Which of the following electron jumps in a hydrogen atom emits the photon of lowest frequency?

The photoelectric effect occurs only when the incident light has more than a certain minimum

If Planck's constant were larger than it is,

Planck's constant is h = 6.6 * 10-34 J·s.The energy of a photon of light whose frequency is 3 * 1014 Hz is

Electrons

The idea that light has both wave and particle properties is accepted because

In an emission spectral series, the

When light is directed at a metal surface, the emitted electrons

A proton and an electron have the same de Broglie wavelength.

X-rays are

An X-ray photon has an energy of 3.3 * 1015 J and Planck's constant is 6.6 * 10-34 J·s.The frequency that corresponds to this energy is

When a hydrogen atom is in its lowest energy level,

The speed of the wave packet that corresponds to a moving particle is

Classical physics cannot account for why

The Scientific Method

Motion

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters

Planck's constant is 6.6 * 10^-34 J·s and the electron mass is 9.1 * 10^-31 kg.The de Broglie wavelength of an electron whose speed is 2.0 * 10⁷ m/s is

Planck's constant is h = 6.6 * 10^-34 J·s.The energy of a photon of light whose frequency is 3 * 10¹⁴ Hz is

An X-ray photon has an energy of 3.3 * 10¹⁵ J and Planck's constant is 6.6 * 10^-34 J·s.The frequency that corresponds to this energy is