Question 1

The phenomena of quantization is NOT found in the following

Accepted Answer

A)  charge on an electron. 
B)  photoelectric effect. 
C)  gravitational effect. 
D)  Compton effect. 
A)  charge on an electron. 
B)  photoelectric effect. 
C)  gravitational effect. 
D)  Compton effect.

Question 2

Light having a wavelength equal to the peak wavelength of a star of what temperature can produce photoelectrons from manganese ($\phi$ = 4.1 eV)

Accepted Answer

A)  960 K 
B)  23000 K 
C)  9600 K 
D)  96000 K 
E)  2300 K 
A)  960 K 
B)  23000 K 
C)  9600 K 
D)  96000 K 
E)  2300 K

Question 3

An x-ray photon with wavelength 15.0 pm is scattered at 84.0$^{\circ}$by an electron.What is the resulting kinetic energy of the electron?

Accepted Answer

A)  568 keV 
B)  59.5 keV 
C)  30.1 keV 
D)  15.0 keV 
E)  10.5 keV 
A)  568 keV 
B)  59.5 keV 
C)  30.1 keV 
D)  15.0 keV 
E)  10.5 keV

Question 4

The radius of the Bohr orbit for hydrogen with n = 3 is ______ time(s)that for the orbit with n = 1.

Accepted Answer

A)  1/3 
B)  3 
C)  6 
D)  9 
E)  18 
A)  1/3 
B)  3 
C)  6 
D)  9 
E)  18

Question 5

The energy of the electron in an atom depends primarily on

Accepted Answer

A)  the spin magnetic quantum number s 
B)  the radial quantum number n 
C)  the orbital angular momentum quantum number l 
D)  the magnetic quantum number m 
A)  the spin magnetic quantum number s 
B)  the radial quantum number n 
C)  the orbital angular momentum quantum number l 
D)  the magnetic quantum number m

Question 6

Electrons are accelerated through a potential difference of 90.0 kV and directed at a tungsten target to produce x-rays.What is the cutoff frequency in the x-ray spectrum produced?

Accepted Answer

A)  2.17 $\times$ 1019 Hz 
B)  2.10 $\times$ 1019 Hz 
C)  1.17 $\times$ 1021 Hz 
D)  9.25 $\times$ 1021 Hz 
E)  6.20 $\times$ 1015 Hz 
A)  2.17 $\times$ 1019 Hz 
B)  2.10 $\times$ 1019 Hz 
C)  1.17 $\times$ 1021 Hz 
D)  9.25 $\times$ 1021 Hz 
E)  6.20 $\times$ 1015 Hz

Question 7

Light of wavelength 400 nm bombards a surface with work function 2.46 eV. What is the maximum kinetic energy of the photoelectrons from this surface?

Accepted Answer

A)  no photoelectrons are emitted 
B)  2.46 eV 
C)  3.30 eV 
D)  0.640 eV 
E)  0.840 eV 
A)  no photoelectrons are emitted 
B)  2.46 eV 
C)  3.30 eV 
D)  0.640 eV 
E)  0.840 eV

Question 8

A problem with the classical theory for radiation from a blackbody was that the theory predicted too much radiation in the ________________ wavelengths.

Accepted Answer

A)  ultraviolet 
B)  visible 
C)  infrared 
D)  microwave 
E)  radio 
A)  ultraviolet 
B)  visible 
C)  infrared 
D)  microwave 
E)  radio

Question 9

Which of the following did the planetary model of the atom fail to explain?

Accepted Answer

A)  the relationship between orbital radius and energy 
B)  why alpha particles in Rutherford's experiment deflected at high angles when incident on atomic foils 
C)  why most alpha particles in Rutherford's experiment passed with little deflection through atomic foils 
D)  why electrons in atoms don't radiate all their energy away rapidly 
A)  the relationship between orbital radius and energy 
B)  why alpha particles in Rutherford's experiment deflected at high angles when incident on atomic foils 
C)  why most alpha particles in Rutherford's experiment passed with little deflection through atomic foils 
D)  why electrons in atoms don't radiate all their energy away rapidly

Question 10

The minimum energy that a photon must have to undergo pair production is

Accepted Answer

A)  0.511 MeV. 
B)  1.022 MeV. 
C)  2.044 MeV. 
D)  0.256 MeV. 
E)  any amount more than zero. 
A)  0.511 MeV. 
B)  1.022 MeV. 
C)  2.044 MeV. 
D)  0.256 MeV. 
E)  any amount more than zero.

Question 11

Using the quantum theory of EM waves,___________ was successful in explaining the photoelectric effect.(He later won a Nobel Prize for this work.)

Accepted Answer

A)  Hertz 
B)  Planck 
C)  Einstein 
D)  Maxwell 
E)  Bohr 
A)  Hertz 
B)  Planck 
C)  Einstein 
D)  Maxwell 
E)  Bohr

Question 12

What is the radius of the ground state of He+?

Accepted Answer

A)  0.0529 nm 
B)  0.193 nm 
C)  0.0265 nm 
D)  0.106 nm 
E)  0.212 nm 
A)  0.0529 nm 
B)  0.193 nm 
C)  0.0265 nm 
D)  0.106 nm 
E)  0.212 nm

Question 13

What is the ionization energy of the hydrogen atom in the n = 2 state?

Accepted Answer

A)  13.6 eV 
B)  -13.6 eV 
C)  3.40 eV 
D)  -3.40 eV 
E)  -1.51 eV 
A)  13.6 eV 
B)  -13.6 eV 
C)  3.40 eV 
D)  -3.40 eV 
E)  -1.51 eV

Question 14

What is the energy of a photon emitted in a transition from the n = 3 state to the n = 2 state in He+?

Accepted Answer

A)  15.1 eV 
B)  7.56 eV 
C)  3.78 eV 
D)  2.12 eV 
E)  1.89 eV 
A)  15.1 eV 
B)  7.56 eV 
C)  3.78 eV 
D)  2.12 eV 
E)  1.89 eV

Question 15

The kinetic energy of an electron in orbit in hydrogen is _______ times its potential energy.

Accepted Answer

A)  1 
B)  -1 
C)  1/2 
D)  -1/2 
E)  2 
A)  1 
B)  -1 
C)  1/2 
D)  -1/2 
E)  2

Question 16

Ultraviolet light is shone on a piece of metal that has a known work function,and electrons are observed being produced through the interaction of the light with the metal.The lamp that produces the light is now replaced with a lamp of the same intensity,but which produces photons having a shorter wavelength.What difference is observed in the number of electrons produced per unit time?

Accepted Answer

A)  The same number are produced. 
B)  Fewer are produced . 
C)  Without knowing more about the wavelengths used,one cannot answer. 
D)  More are produced. 
A)  The same number are produced. 
B)  Fewer are produced . 
C)  Without knowing more about the wavelengths used,one cannot answer. 
D)  More are produced.

Exam 27: Early Quantum Physics and the Photon

The phenomena of quantization is NOT found in the following

Light having a wavelength equal to the peak wavelength of a star of what temperature can produce photoelectrons from manganese ( ϕ\phiϕ = 4.1 eV)

An x-ray photon with wavelength 15.0 pm is scattered at 84.0 ∘^{\circ}∘ by an electron.What is the resulting kinetic energy of the electron?

The radius of the Bohr orbit for hydrogen with n = 3 is ______ time(s)that for the orbit with n = 1.

The energy of the electron in an atom depends primarily on

Electrons are accelerated through a potential difference of 90.0 kV and directed at a tungsten target to produce x-rays.What is the cutoff frequency in the x-ray spectrum produced?

Light of wavelength 400 nm bombards a surface with work function 2.46 eV. What is the maximum kinetic energy of the photoelectrons from this surface?

A problem with the classical theory for radiation from a blackbody was that the theory predicted too much radiation in the ________________ wavelengths.

Which of the following did the planetary model of the atom fail to explain?

The minimum energy that a photon must have to undergo pair production is

Using the quantum theory of EM waves,___________ was successful in explaining the photoelectric effect.(He later won a Nobel Prize for this work.)

What is the radius of the ground state of He+?

What is the ionization energy of the hydrogen atom in the n = 2 state?

What is the energy of a photon emitted in a transition from the n = 3 state to the n = 2 state in He+?

The kinetic energy of an electron in orbit in hydrogen is _______ times its potential energy.

Introduction

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Electromagnetic Induction

Alternating Current

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Filters

Light having a wavelength equal to the peak wavelength of a star of what temperature can produce photoelectrons from manganese ( $\phi$ = 4.1 eV)

An x-ray photon with wavelength 15.0 pm is scattered at 84.0 $^{\circ}$ by an electron.What is the resulting kinetic energy of the electron?

What is the radius of the ground state of He⁺?

What is the energy of a photon emitted in a transition from the n = 3 state to the n = 2 state in He⁺?