Question 1

A photon needed to excite an electron from the   to the   state.What is the energy of the photon?

Accepted Answer

A) 2.55 eV 
B) 6.61 eV 
C) 9.25 eV 
D) 12.8 eV 
E) 20.4 eV 
A) 2.55 eV 
B) 6.61 eV 
C) 9.25 eV 
D) 12.8 eV 
E) 20.4 eV D

Question 2

A photon of wavelength 155 nm is absorbed by the electron in a hydrogen atom that was in the n = 2 state.What is the energy of the electron as it leaves the atom?

Accepted Answer

A) 4.6 eV 
B) 1.2 eV 
C) 5.6 eV 
D) 2.2 eV 
A) 4.6 eV 
B) 1.2 eV 
C) 5.6 eV 
D) 2.2 eV A

Question 3

Krypton has 36 electrons.What is the expected orbital angular momentum quantum number of the outermost electron for Krypton in its first excited state?

Accepted Answer

A) l = 0 
B) l = 1 
C) l = 2 
D) l = 3 
E) l = 4 
A) l = 0 
B) l = 1 
C) l = 2 
D) l = 3 
E) l = 4 A

Question 4

A hydrogen atom in its ground state absorbs a photon of energy 12.75 eV.What is its new value of n,the main quantum number in the Bohr model?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 5

Identify the element that has the configuration 1s22s22p63s23p63d84s2.

Accepted Answer

A) Fe 
B) Ni 
C) Co 
D) Au 
A) Fe 
B) Ni 
C) Co 
D) Au

Question 6

What is the longest wavelength in the Lyman series of hydrogen?

Accepted Answer

A) 122 nm 
B) 312 nm 
C) 415 nm 
D) 535 nm 
A) 122 nm 
B) 312 nm 
C) 415 nm 
D) 535 nm

Question 7

A 5.0 MW UV laser emits light that has a wavelength 350 nm.If the duration of the pulse is 10 ns,how many photons are there in each pulse?

Accepted Answer

A) 8.8 * 1016 
B) 12.3 * 1018 
C) 62.5 * 1020 
D) 89.1 * 1020 
A) 8.8 * 1016 
B) 12.3 * 1018 
C) 62.5 * 1020 
D) 89.1 * 1020

Question 8

A group of hydrogen-like atoms (atoms with only one electron)are in their ground state.Light of increasing intensity is shone at these atoms until the light becomes absorbed by the atoms.The longest wavelength of light when this occurs is 7.61 nm.What is the ground state energy of these atoms?

Accepted Answer

A) 91.8 eV 
B) 13.6 eV 
C) 218 eV 
D) 122 eV 
E) 54 eV 
A) 91.8 eV 
B) 13.6 eV 
C) 218 eV 
D) 122 eV 
E) 54 eV

Question 9

The energy required to ionize hydrogen when the electron is in the second level is _______ the energy required to ionize hydrogen when electron is in the first level.

Accepted Answer

A) twice 
B) half of 
C) four times 
D) one fourth of 
E) equal to 
A) twice 
B) half of 
C) four times 
D) one fourth of 
E) equal to

Question 10

An electron in the hydrogen atom makes a transition from the   state to an nth state.The electron gains 0.50 eV of energy.What value of   is the final state of the electron?

Accepted Answer

A) 0 
B) 2 
C) 4 
D) 6 
E) 8 
A) 0 
B) 2 
C) 4 
D) 6 
E) 8

Question 11

How much energy does a photon need to lift an electron from the n = 2 to the n = 8 level in the hydrogen atom?

Accepted Answer

A) 1.0 eV 
B) 3.19 eV 
C) 7.2 eV 
D) 13.6 eV 
E) 22.4 eV 
A) 1.0 eV 
B) 3.19 eV 
C) 7.2 eV 
D) 13.6 eV 
E) 22.4 eV

Question 12

Find the energy difference between an excited state and the ground state of a system where the population ratio of the excited state to the ground state is 2.9 * 10-4.The temperature of the system is 300 K.

Accepted Answer

A) 0.200 eV 
B) 0.191 eV 
C) 0.211 eV 
D) 0.223 eV 
A) 0.200 eV 
B) 0.191 eV 
C) 0.211 eV 
D) 0.223 eV

Question 13

The frequency of rotation of electron on the second Bohr orbit is

Accepted Answer

A) 3.67 * 1014 Hz 
B) 8.20 * 1014 Hz 
C) 9.03 * 1014 Hz 
D) 6.44 * 1014 Hz 
E) 1.27 * 1015 Hz 
A) 3.67 * 1014 Hz 
B) 8.20 * 1014 Hz 
C) 9.03 * 1014 Hz 
D) 6.44 * 1014 Hz 
E) 1.27 * 1015 Hz

Question 14

How many wave functions (different combinations of l and m)are possible in the n = 6 level of hydrogen?

Accepted Answer

A) 6 
B) 26 
C) 30 
D) 36 
E) 720 
A) 6 
B) 26 
C) 30 
D) 36 
E) 720

Question 15

A hydrogen atom is in a quantum state with principal quantum number n = 9.The atom emits a photon and after emission its principal quantum number becomes 2.The wavelength of the emitted photon is

Accepted Answer

A) 384 nm. 
B) 420 nm. 
C) 557 nm. 
D) 620 nm. 
E) 701 nm. 
A) 384 nm. 
B) 420 nm. 
C) 557 nm. 
D) 620 nm. 
E) 701 nm.

Question 16

The wavelength of the   line of the Balmer group for the hydrogen spectrum is

Accepted Answer

A) 105 nm. 
B) 286 nm. 
C) 371 nm. 
D) 434 nm. 
A) 105 nm. 
B) 286 nm. 
C) 371 nm. 
D) 434 nm.

Question 17

How much energy is contained in a 3.00-mW laser beam of length 2.00 m that moves through vacuum?

Accepted Answer

A) 2.00 * 10-11 J 
B) 1.80 * 10-10 J 
C) 2.00 * 10-8 J 
D) 1.80 * 10-7 J 
A) 2.00 * 10-11 J 
B) 1.80 * 10-10 J 
C) 2.00 * 10-8 J 
D) 1.80 * 10-7 J

Question 18

A photon of wavelength 1.17 $\mu$m is emitted by a He+ when the electron jumps to the n = 5 state.What was the initial state of the electron,prior to the jump?

Accepted Answer

A) 6 
B) 7 
C) 8 
D) 9 
E) 10 
A) 6 
B) 7 
C) 8 
D) 9 
E) 10

Question 19

In a system where the energy difference between the excited state and the ground state is 0.2 eV,what is the population ratio of the excited state relative to the ground state at a temperature of 300 K?

Accepted Answer

A) 4.4 * 10-4 
B) 2.9 * 10-4 
C) 1.02 
D) 0.001 
A) 4.4 * 10-4 
B) 2.9 * 10-4 
C) 1.02 
D) 0.001

Question 20

An excited hydrogen atom emits a photon with an energy of 0.661 eV.What was the initial state of the hydrogen atom before emitting the photon?

Accepted Answer

A) n = 1 
B) n = 2 
C) n = 3 
D) n = 4 
E) n = 5 
A) n = 1 
B) n = 2 
C) n = 3 
D) n = 4 
E) n = 5

Exam 38: Atomic Physics

A photon needed to excite an electron from the to the state.What is the energy of the photon?

A photon of wavelength 155 nm is absorbed by the electron in a hydrogen atom that was in the n = 2 state.What is the energy of the electron as it leaves the atom?

Krypton has 36 electrons.What is the expected orbital angular momentum quantum number of the outermost electron for Krypton in its first excited state?

A hydrogen atom in its ground state absorbs a photon of energy 12.75 eV.What is its new value of n,the main quantum number in the Bohr model?

Identify the element that has the configuration 1s22s22p63s23p63d84s2.

What is the longest wavelength in the Lyman series of hydrogen?

A 5.0 MW UV laser emits light that has a wavelength 350 nm.If the duration of the pulse is 10 ns,how many photons are there in each pulse?

A group of hydrogen-like atoms (atoms with only one electron)are in their ground state.Light of increasing intensity is shone at these atoms until the light becomes absorbed by the atoms.The longest wavelength of light when this occurs is 7.61 nm.What is the ground state energy of these atoms?

The energy required to ionize hydrogen when the electron is in the second level is _______ the energy required to ionize hydrogen when electron is in the first level.

An electron in the hydrogen atom makes a transition from the state to an nth state.The electron gains 0.50 eV of energy.What value of is the final state of the electron?

How much energy does a photon need to lift an electron from the n = 2 to the n = 8 level in the hydrogen atom?

Find the energy difference between an excited state and the ground state of a system where the population ratio of the excited state to the ground state is 2.9 * 10-4.The temperature of the system is 300 K.

The frequency of rotation of electron on the second Bohr orbit is

How many wave functions (different combinations of l and m)are possible in the n = 6 level of hydrogen?

A hydrogen atom is in a quantum state with principal quantum number n = 9.The atom emits a photon and after emission its principal quantum number becomes 2.The wavelength of the emitted photon is

The wavelength of the line of the Balmer group for the hydrogen spectrum is

How much energy is contained in a 3.00-mW laser beam of length 2.00 m that moves through vacuum?

A photon of wavelength 1.17 μ\muμ m is emitted by a He+ when the electron jumps to the n = 5 state.What was the initial state of the electron,prior to the jump?

In a system where the energy difference between the excited state and the ground state is 0.2 eV,what is the population ratio of the excited state relative to the ground state at a temperature of 300 K?

An excited hydrogen atom emits a photon with an energy of 0.661 eV.What was the initial state of the hydrogen atom before emitting the photon?

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Filters

Identify the element that has the configuration 1s²2s²2p⁶3s²3p⁶3d⁸4s².

Find the energy difference between an excited state and the ground state of a system where the population ratio of the excited state to the ground state is 2.9 * 10^-4.The temperature of the system is 300 K.

A photon of wavelength 1.17 $\mu$ m is emitted by a He⁺ when the electron jumps to the n = 5 state.What was the initial state of the electron,prior to the jump?