Deck 10: Atomic Physics

Question 1

The energy of an oscillating atom in a blackbody can be any value within a certain limited range.

Answer 1

False

Question 2

The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature increases.

Answer 2

False

Question 3

In the Bohr model of the hydrogen atom both the energy and orbital angular momentum of the electron are quantized.

Answer 3

True

Question 4

The uncertainty principle states that a particle cannot be precisely localized.

Question 5

A 100 eV electron and a 100 eV proton have equal de Broglie wavelengths.

Question 6

The highest energy level in an atom corresponds to n = 1.

Question 7

The peak of the radiation curve of a blackbody moves upward toward higher intensity as its temperature increases.

Question 8

The early Solvay Conferences had a great effect upon the development of quantum mechanics.

Question 9

Electrons in atoms move about the nucleus in well-defined circular orbits.

Question 10

A photon is quantum of electromagnetic radiation.

Question 11

An atom can be excited into a higher energy state by absorbing a photon.

Question 12

The ground state is the lowest energy level in an atom.

Question 13

An x-ray can be emitted when an electron undergoes an energy level transition.

Question 14

There is a direct correlation between the absorption and emission spectra of a particular gas.

Question 15

Perfect absorbers of electromagnetic radiation are also perfect emitters.

Question 16

In an energy level transition from the n = 2 state to the n =1 state for a hydrogen atom a photon will be emitted.

Question 17

The photoelectric effect occurs when electrons are emitted when light strikes the surface of a metal.

Question 18

In a blackbody,the energy of the oscillating atoms is quantized.

Question 19

The element helium was discovered by studying the Sun's spectrum.

Question 20

An excited atom can lose energy by emitting an electron.

Question 21

The chemical composition of stars can be determined from lines in their spectra.

Question 22

The fact that two electrons cannot occupy the same quantum state at the same time is the Heisenberg exclusion principle.

Question 23

Characteristic peaks occur in an x-ray spectrum of an atom because electrons in the atom make transitions to lower energy levels after being bombarded with high energy electrons.

Question 24

As the intensity of light is increased in a photoelectric effect experiment,the energy of the emitted electrons increases.

Question 25

The energy level diagram for hydrogen
The ionization energy of hydrogen is 13.6 eV.

Question 26

A laser can be used for very accurate measurements of distances between objects.

Question 27

The energy level diagram for hydrogen
The energy of the most energetically possible photon emitted is 10.2 eV.

Question 28

A laser emits monochromatic and coherent light.

Question 29

Photocopiers make use of the photoelectric effect.

Question 30

When the frequency of the light is increased in a photoelectric effect experiment,the energy of the emitted electrons increases.

Question 31

UPC price scanners at supermarket checkouts use laser holography to read the bar codes because the packages are three dimensional.

Question 32

The characteristic peaks in an x-ray spectrum of an atom occur because of rapid deceleration of the bombarding electrons.

Question 33

At any instant in time,it is possible to specify simultaneously the position and the momentum of a particle to arbitrarily high precision.

Question 34

When the speed of an electron is increased the de Broglie wavelength is decreased.

Question 35

The energy level diagram for hydrogen
The energy of a photon emitted in a transition from the n = 3 state to the n = 2 state is 1.9 eV.

Question 36

If an electron acquires more than the ionization energy,the electron will return to the ground state.

Question 37

Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect.

Question 38

The energy level diagram for hydrogen
The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is 13.6 eV.

Question 39

The aurora borealis is an example of atoms and molecules in the atmosphere absorbing photons and exciting the atoms and molecules to emit spectra.

Question 40

Two different gases may have the same emission line spectrum.

Question 41

The person who first explained the blackbody spectrum was

A)Max Planck.
B)Albert Einstein.
C)Neils Bohr.
D)Erwin Schrödinger.
E)Werner Heisenberg.

Question 42

The lowest energy level in an atom is its

A)ionization level.
B)emission level.
C)absorption level.
D)photon level.
E)ground state.

Question 43

An atom can be excited into a higher energy state by

A)emitting a photon.
B)absorbing a photon.
C)undergoing the photoelectric effect.
D)decreasing its de Broglie wavelength.
E)the uncertainty principle.

Question 44

What quantities are plotted on a blackbody radiation curve?

A)total radiated energy vs.temperature
B)radiation intensity vs.wavelength
C)wavelength of peak emission vs.temperature
D)none of the above

Question 45

What does it mean for something to be "quantized?"

A)It can have only certain discrete values.
B)It can have only integer values.
C)It can have values only between certain limits.
D)none of the above

Question 46

What is the symbol used for Planck's constant?

A)p
B)
C)h
D)none of the above

Question 47

The energy associated with a photon of blue light is ________________ the energy associated with a photon of red light.

A)greater than
B)less than
C)equal to
D)unrelated to

Question 48

The fact that a particle cannot be precisely localized is the

A)photoelectric effect.
B)uncertainty principle.
C)principle of a hologram.
D)principle of a laser.
E)reason why photons are emitted.

Question 49

An excited atom can lose energy by

A)emitting a photon.
B)absorbing a photon.
C)undergoing the photoelectric effect.
D)increasing its de Broglie wavelength.
E)the uncertainty principle.

Question 50

Electron diffraction shows

A)that electrons behave like waves.
B)the photoelectric effect.
C)characteristic x-ray spectra.
D)that electrons in atoms have only certain allowed energies.

Question 51

The quantity that is quantized in the oscillating atoms of a blackbody is

A)angular momentum.
B)energy.
C)the emission spectrum.
D)the absorption spectrum.
E)the wave function.

Question 52

What is coherent light?

A)light of a single wavelength
B)light that is all in phase
C)light that is polarized in one direction
D)none of the above

Question 53

In the Bohr model of the hydrogen atom

A)energy is quantized.
B)the electron's angular momentum is quantized.
C)the emission spectrum is quantized.
D)the absorption spectrum is quantized.
E)all of the above

Question 54

What is "excluded" by the Pauli exclusion principle?

A)certain values of angular momentum
B)precise values of both position and momentum
C)electrons in the same quantum state
D)none of the above

Question 55

A three-dimensional image made using a laser is a(n)

A)emission spectrum.
B)absorption spectrum.
C)wave function.
D)hologram.
E)photoelectric effect.

Question 56

The highest energy level in an atom is its

A)ionization level.
B)emission level.
C)absorption level.
D)photon level.
E)ground state.

Question 57

A quantum of electromagnetic radiation is a

A)wave function.
B)photon.
C)de Broglie wave.
D)laser.
E)hologram.

Question 58

If the speed of an electron increases,its de Broglie wavelength

A)increases.
B)decreases.
C)stays the same.
D)may increase or decrease.

Question 59

Electrons emitted when light strikes the surface of a metal is

A)photon emission.
B)photon absorption.
C)the photoelectric effect.
D)a laser.
E)an emission spectrum.

Question 60

Which of these is not involved in the operation of lasers?

A)stimulated emission
B)population inversion
C)metastable state
D)blackbody radiation

Question 61

The energy level diagram for hydrogen
The energy of the most energetically possible photon emitted is

A)1.5 eV.
B)1.9 eV.
C)3.4 eV.
D)10.2 eV.
E)13.6 eV.

Question 62

When the intensity of the light is increased in a photoelectric effect experiment,the energy of the emitted electrons

A)increases.
B)decreases.
C)stays the same.
D)becomes more quantized.
E)becomes less quantized.

Question 63

In a laser

A)light is amplified by stimulated emission of radiation.
B)the emitted light is monochromatic.
C)the emitted light is coherent.
D)there is a population inversion of electrons in atoms.
E)all of the above

Question 64

The energy level diagram for hydrogen
The ionization energy of hydrogen is

A)1.5 eV.
B)1.9 eV.
C)3.4 eV.
D)10.2 eV.
E)13.6 eV.

Question 65

The person who developed the concept of a wave function was

A)Max Planck.
B)Albert Einstein.
C)Neils Bohr.
D)Erwin Schrödinger.
E)Werner Heisenberg.

Question 66

The characteristic peaks in an x-ray spectrum of an atom occur because

A)of photon absorption.
B)of the photoelectric effect.
C)electrons in the atom make transitions to lower energy levels.
D)of the uncertainty principle.
E)of rapid deceleration of the bombarding electrons.

Question 67

When the frequency of the light is increased in a photoelectric effect experiment,the energy of the emitted electrons

A)increases.
B)decreases.
C)stays the same.
D)becomes more quantized.
E)becomes less quantized.

Question 68

The spectra of different elements can be distinguished because

A)they have the same spectral lines,but the lines are of different intensities.
B)they have spectral lines in different positions.
C)every element has one unique spectral line.
D)none of the above

Question 69

The person who first explained the discrete hydrogen atom spectrum was

A)Max Planck.
B)Albert Einstein.
C)Neils Bohr.
D)Erwin Schrödinger.
E)Werner Heisenberg.

Question 70

How small an object can a scanning tunneling microscope "see?"

A)about the size of a mushroom spore
B)about the size of a living cell
C)as small as a single atom
D)as small as the nucleus of an atom

Question 71

Lasers are used

A)to produce holograms.
B)in surgery.
C)to measure distances between objects accurately.
D)in DVD and compact disc players.
E)all of the above

Question 72

The continuous part of an x-ray spectrum of an atom occurs because

A)of photon absorption.
B)of the photoelectric effect.
C)electrons in the atom make transitions to lower energy levels.
D)of the uncertainty principle.
E)of rapid deceleration of the bombarding electrons.

Question 73

The person who expounded the uncertainty principle was

A)Max Planck.
B)Albert Einstein.
C)Neils Bohr.
D)Erwin Schrödinger.
E)Werner Heisenberg.

Question 74

The aurora borealis (northern lights)are caused by

A)sunlight reflecting from polar ice.
B)emissions from atoms and molecules in the upper atmosphere excited by electrons from the Sun.
C)thunderstorms.
D)an unknown process.

Question 75

The energy level diagram for hydrogen
The energy of a photon emitted in a transition from the n = 3 state to the n = 2 state is

A)1.5 eV.
B)1.9 eV.
C)3.4 eV.
D)10.2 eV.
E)13.6 eV.

Question 76

What is meant by a line spectrum?

A)a spectrum which is straight
B)a spectrum made of bright lines in certain places,separated by dark gaps
C)a spectrum made by a hot filament stretched into a straight line
D)none of the above

Question 77

The energy of a photon that ionizes a hydrogen atom from the ground state will be _________ the energy of a photon that ionizes a different hydrogen atom from the first excited state (n - 2).

A)larger than
B)smaller than
C)equal to
D)twice

Question 78

Which of the following devices make use of the photoelectric effect?

A)digital cameras
B)photocopiers
C)laser printers
D)solar cells
E)all of the above

Question 79

The energy level diagram for hydrogen
The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is

A)1.5 eV.
B)1.9 eV.
C)3.4 eV.
D)10.2 eV.
E)13.6 eV.

Question 80

The person who first explained the photoelectric effect was

A)Max Planck.
B)Albert Einstein.
C)Neils Bohr.
D)Erwin Schrödinger.
E)Werner Heisenberg.