Question 1

When stimulated emission occurs,the emitted photon and the incident (stimulating)photon have exactly the same energy and travel in the same direction.

Accepted Answer

A) True 
 B)False  True

Question 2

In atoms having two or more electrons,no two electrons can have the same value for all four quantum numbers.

Accepted Answer

A) True 
 B)False  True

Question 3

A hydrogen atom makes a downward transition from the n = 20 state to the n = 5 state.Find the wavelength of the emitted photon.

Accepted Answer

A) 2.43 μm 
B) 1.46 μm 
C) 1.94 μm 
D) 2.92 μm 
A) 2.43 μm 
B) 1.46 μm 
C) 1.94 μm 
D) 2.92 μm A

Question 4

All stationary states of the hydrogen atom for which n = 4 have the same energy.

Accepted Answer

A) True 
 B)False

Question 5

Which of the statements below is true?

Accepted Answer

A) For a particular shell,an electron in a hydrogen atom with a higher angular momentum is more likely to be found in a smaller range of distances from the proton. 
B) For a particular shell,an electron in a hydrogen atom with a higher angular momentum is more likely to be found in a larger range of distances from the proton. 
C) For a particular shell,an electron in a hydrogen atom with a higher angular momentum will have a higher mechanical energy. 
D) For a particular shell,an electron in a hydrogen atom with a higher angular momentum is more likely to be found farther from the proton. 
A) For a particular shell,an electron in a hydrogen atom with a higher angular momentum is more likely to be found in a smaller range of distances from the proton. 
B) For a particular shell,an electron in a hydrogen atom with a higher angular momentum is more likely to be found in a larger range of distances from the proton. 
C) For a particular shell,an electron in a hydrogen atom with a higher angular momentum will have a higher mechanical energy. 
D) For a particular shell,an electron in a hydrogen atom with a higher angular momentum is more likely to be found farther from the proton.

Question 6

It is impossible for an electron to lose its spin angular momentum.

Accepted Answer

A) True 
 B)False

Question 7

Light excites atomic hydrogen from its lowest level to the n = 12 level.What is the energy of the light?

Accepted Answer

A) 13.7 eV 
B) 32.2 eV 
C) 61.4 eV 
D) 91.8 eV 
A) 13.7 eV 
B) 32.2 eV 
C) 61.4 eV 
D) 91.8 eV

Question 8

An atom has completely filled inner shells and a single valence electron in an excited p state.The filled inner shells have an orbital momentum equal to zero.The magnitude of the orbital angular momentum of the atom is closest to:

Accepted Answer

A) 1.0   
B) 1.2   
C) 1.4   
D) 1.7   
E) 2.0   
A) 1.0   
B) 1.2   
C) 1.4   
D) 1.7   
E) 2.0

Question 9

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state.This radiation has a wavelength of 21 cm.What is the energy difference between the hyperfine levels?

Accepted Answer

A) 5.92 × 10-6 eV 
B) 5.92 × 10-25 J 
C) 1.66 × 10-24 J 
D) 4.73 × 10-25 J 
A) 5.92 × 10-6 eV 
B) 5.92 × 10-25 J 
C) 1.66 × 10-24 J 
D) 4.73 × 10-25 J

Question 10

Do all transitions (excluding fine and hyperfine transitions)that end up in the ground state of hydrogen give ultraviolet light? Why?

Accepted Answer

Yes.The lowest energ

Question 11

In Bohr's model of the hydrogen atom,electrons orbiting the proton with a high orbital radius have

Accepted Answer

A) less kinetic energy,more potential energy,and more mechanical energy than those with a low orbital radius. 
B) less kinetic energy,more potential energy,and the same mechanical energy than those with a low orbital radius. 
C) more kinetic energy,less potential energy,and more mechanical energy than those with a low orbital radius. 
D) less kinetic energy,less potential energy,and less mechanical energy than those with a low orbital radius. 
A) less kinetic energy,more potential energy,and more mechanical energy than those with a low orbital radius. 
B) less kinetic energy,more potential energy,and the same mechanical energy than those with a low orbital radius. 
C) more kinetic energy,less potential energy,and more mechanical energy than those with a low orbital radius. 
D) less kinetic energy,less potential energy,and less mechanical energy than those with a low orbital radius.

Question 12

One of the emission lines described by the original version of Balmer's formula has wavelength 372 nm.What is the value of n in Balmer's formula that gives this emission line?

Accepted Answer

A) 14 
B) 15 
C) 16 
D) 17 
A) 14 
B) 15 
C) 16 
D) 17

Question 13

A hydrogen atom is excited to the n = 10 level.Its decay to the n = 4 level is detected in a photographic plate.What is the frequency of the light photographed?

Accepted Answer

A) 1.73 × 1014 Hz 
B) 1740 Hz 
C) 1740 nm 
D) 1.46 × 10-9 km 
A) 1.73 × 1014 Hz 
B) 1740 Hz 
C) 1740 nm 
D) 1.46 × 10-9 km

Question 14

The energy required to remove the electron from a hydrogen atom in the n = 11 state is closest to:

Accepted Answer

A) 0.11 eV 
B) 0.094 eV 
C) 0.080 eV 
D) 0.17 eV 
E) 0.14 eV 
A) 0.11 eV 
B) 0.094 eV 
C) 0.080 eV 
D) 0.17 eV 
E) 0.14 eV

Question 15

The electron cloud of an atom is formed because the electron spreads out in space.

Accepted Answer

A) True 
 B)False

Question 16

What is the frequency of the light emitted by atomic Hydrogen according to Balmer's formula with m = 8 and n = 12?

Accepted Answer

A) 2.86 × 1013 Hz 
B) 10,500 Hz 
C) 5830 nm 
D) 5.83 × 10-6 m 
A) 2.86 × 1013 Hz 
B) 10,500 Hz 
C) 5830 nm 
D) 5.83 × 10-6 m

Question 17

A hydrogen atom is excited to the n = 6 level.Its decay to the n = 2 level is detected in a photographic plate.What is the wavelength of the detected emission?

Accepted Answer

A) 410 nm 
B) 93.8 nm 
C) 1090 nm 
D) 93.1 nm 
A) 410 nm 
B) 93.8 nm 
C) 1090 nm 
D) 93.1 nm

Question 18

What is the greatest magnitude of the orbital angular momentum L that you can find in a state with n = 6?

Accepted Answer

A) 5.48   
B) 5.92   
C) 6   
D) 6.48   
A) 5.48   
B) 5.92   
C) 6   
D) 6.48

Question 19

According to the Bohr model of the atom,an electron can only jump from a high to a low energy state if it emits a photon whose energy is the same as the energy difference between those two states.

Accepted Answer

A) True 
 B)False

Question 20

A hydrogen atom is in its n = 2 excited state when its electron absorbs 9.5 eV in an interaction with a photon.What is the energy of the resulting free electron?

Accepted Answer

A) 5.1 eV 
B) 6.6 eV 
C) 6.9 eV 
D) 7.6 eV 
A) 5.1 eV 
B) 6.6 eV 
C) 6.9 eV 
D) 7.6 eV

Exam 29: Atoms and Molecules

When stimulated emission occurs,the emitted photon and the incident (stimulating)photon have exactly the same energy and travel in the same direction.

In atoms having two or more electrons,no two electrons can have the same value for all four quantum numbers.

A hydrogen atom makes a downward transition from the n = 20 state to the n = 5 state.Find the wavelength of the emitted photon.

All stationary states of the hydrogen atom for which n = 4 have the same energy.

Which of the statements below is true?

It is impossible for an electron to lose its spin angular momentum.

Light excites atomic hydrogen from its lowest level to the n = 12 level.What is the energy of the light?

An atom has completely filled inner shells and a single valence electron in an excited p state.The filled inner shells have an orbital momentum equal to zero.The magnitude of the orbital angular momentum of the atom is closest to:

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state.This radiation has a wavelength of 21 cm.What is the energy difference between the hyperfine levels?

Do all transitions (excluding fine and hyperfine transitions)that end up in the ground state of hydrogen give ultraviolet light? Why?

In Bohr's model of the hydrogen atom,electrons orbiting the proton with a high orbital radius have

One of the emission lines described by the original version of Balmer's formula has wavelength 372 nm.What is the value of n in Balmer's formula that gives this emission line?

A hydrogen atom is excited to the n = 10 level.Its decay to the n = 4 level is detected in a photographic plate.What is the frequency of the light photographed?

The energy required to remove the electron from a hydrogen atom in the n = 11 state is closest to:

The electron cloud of an atom is formed because the electron spreads out in space.

What is the frequency of the light emitted by atomic Hydrogen according to Balmer's formula with m = 8 and n = 12?

A hydrogen atom is excited to the n = 6 level.Its decay to the n = 2 level is detected in a photographic plate.What is the wavelength of the detected emission?

What is the greatest magnitude of the orbital angular momentum L that you can find in a state with n = 6?

According to the Bohr model of the atom,an electron can only jump from a high to a low energy state if it emits a photon whose energy is the same as the energy difference between those two states.

A hydrogen atom is in its n = 2 excited state when its electron absorbs 9.5 eV in an interaction with a photon.What is the energy of the resulting free electron?

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