Question 1

Planck's constant is h = 6.6 * 10-34 Js and the electron mass is 9.1* 10-31 kg.The de Broglie wavelength of an electron whose speed is 108 m/s is

Accepted Answer

A) 5.9 * 10-56 m. 
B) 1.5 * 10-19 m. 
C) 7.3 * 10-12 m. 
D) 1.4 * 1011 m. 
A) 5.9 * 10-56 m. 
B) 1.5 * 10-19 m. 
C) 7.3 * 10-12 m. 
D) 1.4 * 1011 m. C

Question 2

The wider the wavepacket of a particle, the

Accepted Answer

A) longer its wavelength. 
B) higher its speed. 
C) more precisely its position can be determined. 
D) more precisely its momentum can be determined. 
A) longer its wavelength. 
B) higher its speed. 
C) more precisely its position can be determined. 
D) more precisely its momentum can be determined. D

Question 3

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. D

Question 4

The wave character of a moving golf ball is not observed because

Accepted Answer

A) the ball is uncharged. 
B) the matter waves are moving too fast. 
C) the frequency of the matter waves is too low. 
D) the wavelength of the matter waves is too short. 
A) the ball is uncharged. 
B) the matter waves are moving too fast. 
C) the frequency of the matter waves is too low. 
D) the wavelength of the matter waves is too short.

Question 5

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 6

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 7

A p orbital

Accepted Answer

A) is spherical in shape. 
B) is shaped like a doughnut. 
C) has two lobes. 
D) has six lobes. 
A) is spherical in shape. 
B) is shaped like a doughnut. 
C) has two lobes. 
D) has six lobes.

Question 8

A beam of light whose waves are all in step with one another is said to be

Accepted Answer

A) coherent. 
B) incoherent. 
C) quantized. 
D) diffracted. 
A) coherent. 
B) incoherent. 
C) quantized. 
D) diffracted.

Question 9

Which of the following cannot be explained by the quantum theory of light?

Accepted Answer

A) interference 
B) blackbody radiation 
C) the photoelectric effect 
D) X-ray production 
A) interference 
B) blackbody radiation 
C) the photoelectric effect 
D) X-ray production

Question 10

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.

Question 11

The number of quantum numbers needed to describe the state of an atomic electron is

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
A) 1. 
B) 2. 
C) 3. 
D) 4.

Question 12

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 13

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 14

The quantum number n of the lowest energy state of a hydrogen atom

Accepted Answer

A) is 0. 
B) is 1. 
C) depends on the orbit size. 
D) depends on the electron speed. 
A) is 0. 
B) is 1. 
C) depends on the orbit size. 
D) depends on the electron speed.

Question 15

According to the uncertainty principle, it is impossible to precisely determine

Accepted Answer

A) only the position of a particle. 
B) only the momentum of a particle. 
C) either the position or the momentum of a particle. 
D) both the position and the momentum of a particle. 
A) only the position of a particle. 
B) only the momentum of a particle. 
C) either the position or the momentum of a particle. 
D) both the position and the momentum of a particle.

Question 16

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.

Question 17

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 18

The energy difference between adjacent energy levels in a hydrogen atom

Accepted Answer

A) decreases with increasing quantum numbers. 
B) increases with increasing quantum numbers. 
C) is the same for all quantum numbers. 
D) shows no regularities. 
A) decreases with increasing quantum numbers. 
B) increases with increasing quantum numbers. 
C) is the same for all quantum numbers. 
D) shows no regularities.

Question 19

The sun's spectrum consists of a bright background crossed by dark lines.This suggests that the sun

Accepted Answer

A) is a hot object surrounded by a hot atmosphere. 
B) is a hot object surrounded by a cool temperature. 
C) is a cool object surrounded by a hot temperature. 
D) is a cool object surrounded by a cool atmosphere. 
A) is a hot object surrounded by a hot atmosphere. 
B) is a hot object surrounded by a cool temperature. 
C) is a cool object surrounded by a hot temperature. 
D) is a cool object surrounded by a cool atmosphere.

Question 20

Matter waves are

Accepted Answer

A) associated with all particles. 
B) never associated with stationary particles. 
C) never associated with charged particles. 
D) never associated with uncharged particles. 
A) associated with all particles. 
B) never associated with stationary particles. 
C) never associated with charged particles. 
D) never associated with uncharged particles.

Planck's constant is h = 6.6 * 10^-34 Js and the electron mass is 9.1* 10^-31 kg.The de Broglie wavelength of an electron whose speed is 10⁸ m/s is

The wider the wavepacket of a particle, the

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

The wave character of a moving golf ball is not observed because

When a hydrogen atom is in its lowest energy level,

In an emission spectral series, the

A p orbital

A beam of light whose waves are all in step with one another is said to be

Which of the following cannot be explained by the quantum theory of light?

Classical physics cannot account for why

The number of quantum numbers needed to describe the state of an atomic electron is

X-rays are

Electrons

The quantum number n of the lowest energy state of a hydrogen atom

According to the uncertainty principle, it is impossible to precisely determine

The light waves from a laser

Photons have

The energy difference between adjacent energy levels in a hydrogen atom

The sun's spectrum consists of a bright background crossed by dark lines.This suggests that the sun

Matter waves are

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

The Universe

Filters

Exam 9: The Atom

Planck's constant is h = 6.6 * 10-34 Js and the electron mass is 9.1* 10-31 kg.The de Broglie wavelength of an electron whose speed is 108 m/s is

The wider the wavepacket of a particle, the

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

The wave character of a moving golf ball is not observed because

When a hydrogen atom is in its lowest energy level,

In an emission spectral series, the

A p orbital

A beam of light whose waves are all in step with one another is said to be

Which of the following cannot be explained by the quantum theory of light?

Classical physics cannot account for why

The number of quantum numbers needed to describe the state of an atomic electron is

X-rays are

Electrons

The quantum number n of the lowest energy state of a hydrogen atom

According to the uncertainty principle, it is impossible to precisely determine

The light waves from a laser

Photons have

The energy difference between adjacent energy levels in a hydrogen atom

The sun's spectrum consists of a bright background crossed by dark lines.This suggests that the sun

Matter waves are

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

The Universe

Filters

Planck's constant is h = 6.6 * 10^-34 Js and the electron mass is 9.1* 10^-31 kg.The de Broglie wavelength of an electron whose speed is 10⁸ m/s is