Question 1

An excited atom decays to its ground state and emits a photon of green light. If instead the decay is to an intermediate state, then the light emitted could be

Accepted Answer

A) red. 
B) violet. 
C) blue. 
D) any of the above 
E) none of the above 
A) red. 
B) violet. 
C) blue. 
D) any of the above 
E) none of the above

Question 2

What was discovered in atomic spectra by physics pioneers Balmer, Rydberg, and Ritz?

Accepted Answer

A) unexplained randomness 
B) mathematical order 
C) all atoms are about the same size 
D) electrons occupy well-defined shells about the atomic nucleus 
E) electrons behave as standing waves 
A) unexplained randomness 
B) mathematical order 
C) all atoms are about the same size 
D) electrons occupy well-defined shells about the atomic nucleus 
E) electrons behave as standing waves

Question 3

The first to be credited for assigning the terms positive and negative to electricity was

Accepted Answer

A) William Crookes. 
B) J.J. Thomson. 
C) Robert Millikan. 
D) Benjamin Franklin. 
E) none of the above 
A) William Crookes. 
B) J.J. Thomson. 
C) Robert Millikan. 
D) Benjamin Franklin. 
E) none of the above

Question 4

Using the Schrödinger equation, scientists can calculate

Accepted Answer

A) probabilities. 
B) the position of an electron. 
C) the velocity of an electron. 
D) all of the above 
A) probabilities. 
B) the position of an electron. 
C) the velocity of an electron. 
D) all of the above

Question 5

Some alpha particles pass through gold foil with very little deflection mainly because the

Accepted Answer

A) electric field is zero inside the foil. 
B) atoms of gold are mostly empty space. 
C) net charge of the gold atoms is zero. 
D) all of the above 
E) none of the above 
A) electric field is zero inside the foil. 
B) atoms of gold are mostly empty space. 
C) net charge of the gold atoms is zero. 
D) all of the above 
E) none of the above

Question 6

Quantization of electron energy states in an atom is better understood in terms of the electron's

Accepted Answer

A) wave nature. 
B) particle nature. 
C) neither of these 
A) wave nature. 
B) particle nature. 
C) neither of these

Question 7

In the electron-wave model of the atom, the orbit of an electron in the ground state contains

Accepted Answer

A) a single wavelength. 
B) multiple wavelengths. 
C) even number quanta. 
A) a single wavelength. 
B) multiple wavelengths. 
C) even number quanta.

Question 8

In the electron-wave model of the atom, an electron in the second energy level contains

Accepted Answer

A) a single wavelength. 
B) two wavelengths. 
C) any number of wavelengths. 
D) none of the above 
A) a single wavelength. 
B) two wavelengths. 
C) any number of wavelengths. 
D) none of the above

Question 9

A beam of electrons has

Accepted Answer

A) wave properties. 
B) particle properties. 
C) both of these 
D) neither of these 
A) wave properties. 
B) particle properties. 
C) both of these 
D) neither of these

Question 10

Some alpha particles fired at a gold foil bounced backward as a result of

Accepted Answer

A) reflection from the surfaces of gold atoms. 
B) electrostatic repulsion by gold nuclei. 
C) electrostatic repulsion by electrons within gold atoms. 
D) all of the above 
E) none of the above 
A) reflection from the surfaces of gold atoms. 
B) electrostatic repulsion by gold nuclei. 
C) electrostatic repulsion by electrons within gold atoms. 
D) all of the above 
E) none of the above

Question 11

A beam of electrons can be deflected by a

Accepted Answer

A) magnetic field. 
B) electric field. 
C) both of these 
D) neither of these 
A) magnetic field. 
B) electric field. 
C) both of these 
D) neither of these

Question 12

Millikan was able to stop falling oil droplets in their paths by

Accepted Answer

A) opposing electric and gravitational forces. 
B) magnetic repulsion. 
C) both of these 
D) neither of these 
A) opposing electric and gravitational forces. 
B) magnetic repulsion. 
C) both of these 
D) neither of these

Question 13

A beam of electrons is employed in

Accepted Answer

A) a gold-foil experiment. 
B) a cathode-ray tube. 
C) a LED television screen. 
D) an oil-drop experiment. 
A) a gold-foil experiment. 
B) a cathode-ray tube. 
C) a LED television screen. 
D) an oil-drop experiment.

Question 14

The finding that electrons in an atom occupy a volume much greater than the volume of the nucleus is best explained by

Accepted Answer

A) electromagnetic forces. 
B) angular momentum conservation. 
C) relative sizes of electrons and nuclei. 
D) the wave nature of the electron. 
E) none of the above 
A) electromagnetic forces. 
B) angular momentum conservation. 
C) relative sizes of electrons and nuclei. 
D) the wave nature of the electron. 
E) none of the above

Question 15

An excited hydrogen atom is capable of emitting radiation of

Accepted Answer

A) a single frequency. 
B) three frequencies. 
C) many more than three frequencies. 
A) a single frequency. 
B) three frequencies. 
C) many more than three frequencies.

Question 16

When Millikan observed oil drops hovering at rest in his chamber, he knew that

Accepted Answer

A) an upward electric force balanced the weight of each drop. 
B) each drop was in mechanical equilibrium. 
C) the net force on each drop was zero. 
D) all of the above 
E) none of the above 
A) an upward electric force balanced the weight of each drop. 
B) each drop was in mechanical equilibrium. 
C) the net force on each drop was zero. 
D) all of the above 
E) none of the above

Question 17

By scattering alpha particles from gold, Rutherford showed the atomic nucleus to be very

Accepted Answer

A) small relative to the atom. 
B) massive relative to the mass of an electron. 
C) both of these 
D) neither of these 
A) small relative to the atom. 
B) massive relative to the mass of an electron. 
C) both of these 
D) neither of these

Question 18

Two spectral lines in a spectrum have frequencies of 2.0 x 1014 Hz and 4.6 x 1014 Hz. A higher-frequency line in the same spectrum likely has a frequency of

Accepted Answer

A) 2.6 x 1014 Hz. 
B) 6.6 x 1014 Hz. 
C) 13.2 x 1014 Hz. 
D) none of the above 
A) 2.6 x 1014 Hz. 
B) 6.6 x 1014 Hz. 
C) 13.2 x 1014 Hz. 
D) none of the above

Question 19

According to de Broglie, constructive interference occurs when an orbiting wave

Accepted Answer

A) reinforces itself 
B) doesn't reinforce itself. 
C) neither of these 
A) reinforces itself 
B) doesn't reinforce itself. 
C) neither of these

Question 20

Alpha particles are normally repelled by atomic nuclei because

Accepted Answer

A) their closeness with atomic nuclei violates quantum rules. 
B) of oppositely-directed forces. 
C) they both have the same sign of electric charge. 
D) all of the above 
E) none of the above 
A) their closeness with atomic nuclei violates quantum rules. 
B) of oppositely-directed forces. 
C) they both have the same sign of electric charge. 
D) all of the above 
E) none of the above

Exam 32: The Atom and the Quantum

An excited atom decays to its ground state and emits a photon of green light. If instead the decay is to an intermediate state, then the light emitted could be

What was discovered in atomic spectra by physics pioneers Balmer, Rydberg, and Ritz?

The first to be credited for assigning the terms positive and negative to electricity was

Using the Schrödinger equation, scientists can calculate

Some alpha particles pass through gold foil with very little deflection mainly because the

Quantization of electron energy states in an atom is better understood in terms of the electron's

In the electron-wave model of the atom, the orbit of an electron in the ground state contains

In the electron-wave model of the atom, an electron in the second energy level contains

A beam of electrons has

Some alpha particles fired at a gold foil bounced backward as a result of

A beam of electrons can be deflected by a

Millikan was able to stop falling oil droplets in their paths by

A beam of electrons is employed in

The finding that electrons in an atom occupy a volume much greater than the volume of the nucleus is best explained by

An excited hydrogen atom is capable of emitting radiation of

When Millikan observed oil drops hovering at rest in his chamber, he knew that

By scattering alpha particles from gold, Rutherford showed the atomic nucleus to be very

Two spectral lines in a spectrum have frequencies of 2.0 x 1014 Hz and 4.6 x 1014 Hz. A higher-frequency line in the same spectrum likely has a frequency of

According to de Broglie, constructive interference occurs when an orbiting wave

Alpha particles are normally repelled by atomic nuclei because

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Two spectral lines in a spectrum have frequencies of 2.0 x 10¹⁴ Hz and 4.6 x 10¹⁴ Hz. A higher-frequency line in the same spectrum likely has a frequency of