Question 1

The ratio of energy to frequency for a given photon gives

Accepted Answer

A) its amplitude. 
B) its velocity. 
C) its wavelength. 
D) Planck's constant. 
E) its work function. 
A) its amplitude. 
B) its velocity. 
C) its wavelength. 
D) Planck's constant. 
E) its work function.

Question 2

What is a photon?

Accepted Answer

A) an electron in an excited state 
B) a small packet of electromagnetic energy that has particle-like properties 
C) one form of a nucleon, one of the particles that makes up the nucleus 
D) an electron that has been made electrically neutral 
E) a proton that has been made electrically neutral 
A) an electron in an excited state 
B) a small packet of electromagnetic energy that has particle-like properties 
C) one form of a nucleon, one of the particles that makes up the nucleus 
D) an electron that has been made electrically neutral 
E) a proton that has been made electrically neutral

Question 3

What is the wavelength of a neutron having a kinetic energy of 0.025 eV? (The mass of a neutron is 1.67 × 10-27 kg.)

Accepted Answer

A) 3.7 × 10-22 m 
B) 2200 m 
C) 1100 m 
D) 1.8 × 10-10 m 
E) 3.2 × 10-20 m 
A) 3.7 × 10-22 m 
B) 2200 m 
C) 1100 m 
D) 1.8 × 10-10 m 
E) 3.2 × 10-20 m

Question 4

What advantage might an electron microscope have over a light microscope?

Accepted Answer

A) Electrons are more powerful. 
B) Shorter wavelengths are possible. 
C) Longer wavelengths are possible. 
D) none of the given answers 
A) Electrons are more powerful. 
B) Shorter wavelengths are possible. 
C) Longer wavelengths are possible. 
D) none of the given answers

Question 5

What is the momentum of a photon of light that has a frequency of 2.8 × 1014 Hz?

Accepted Answer

A) 1.5 × 10-28 kg∙m/s 
B) 2.1 × 10-28 kg∙m/s 
C) 4.4 × 10-28 kg∙m/s 
D) 6.3 × 10-28 kg∙m/s 
E) 6.2 × 10-28 kg∙m/s 
A) 1.5 × 10-28 kg∙m/s 
B) 2.1 × 10-28 kg∙m/s 
C) 4.4 × 10-28 kg∙m/s 
D) 6.3 × 10-28 kg∙m/s 
E) 6.2 × 10-28 kg∙m/s

Question 6

If a star has a peak intensity at 580 nm, what is its temperature?

Accepted Answer

A) 2000 K 
B) 5000°F 
C) 2000°C 
D) 5000 K 
E) 5000°C 
A) 2000 K 
B) 5000°F 
C) 2000°C 
D) 5000 K 
E) 5000°C

Question 7

As a particle travels faster, its de Broglie wavelength

Accepted Answer

A) increases. 
B) decreases. 
C) remains constant. 
D) could be any of the given answers; it depends on other factors. 
A) increases. 
B) decreases. 
C) remains constant. 
D) could be any of the given answers; it depends on other factors.

Question 8

In the spectrum of white light which one of the following colors corresponds to the highest temperature?

Accepted Answer

A) Yellow 
B) Violet 
C) Green 
D) Red 
E) Orange 
A) Yellow 
B) Violet 
C) Green 
D) Red 
E) Orange

Question 9

In an electron two-slit experiment, the slits are 15 μm apart. If the first diffraction maximum lies at an angle of 5.0 × 10-7 rad, what is the momentum of the incoming electrons?

Accepted Answer

A) 4.4 × 10-23 kg∙m/s 
B) 2.2 × 10-23 kg∙m/s 
C) 11 × 10-23 kg∙m/s 
D) 6.6 × 10-23 kg∙m/s 
E) 8.8 × 10-23 kg∙m/s 
A) 4.4 × 10-23 kg∙m/s 
B) 2.2 × 10-23 kg∙m/s 
C) 11 × 10-23 kg∙m/s 
D) 6.6 × 10-23 kg∙m/s 
E) 8.8 × 10-23 kg∙m/s

Question 10

Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should

Accepted Answer

A) use light of a longer wavelength. 
B) use light of a shorter wavelength. 
C) use light of the same wavelength but increase its intensity. 
D) use light of the same wavelength but decrease its intensity. 
A) use light of a longer wavelength. 
B) use light of a shorter wavelength. 
C) use light of the same wavelength but increase its intensity. 
D) use light of the same wavelength but decrease its intensity.

Question 11

An ideal blackbody absorbs all of the light that is incident on it.

Accepted Answer

A) True 
 B)False

Question 12

A proton and an electron are both accelerated to the same final kinetic energy. If λp is the de Broglie wavelength of the proton and λ3 is the de Broglie wavelength of the electron, then

Accepted Answer

A) λp > λe. 
B) λp = λe. 
C) λp e. 
D) Not enough data to answer this question. 
A) λp > λe. 
B) λp = λe. 
C) λp e. 
D) Not enough data to answer this question.

Question 13

Blackbody radiation is from a body that

Accepted Answer

A) does not emit radiation in the visible. 
B) is black. 
C) deflects all radiation falling on it. 
D) absorbs all radiation falling on it. 
E) is actually white. 
A) does not emit radiation in the visible. 
B) is black. 
C) deflects all radiation falling on it. 
D) absorbs all radiation falling on it. 
E) is actually white.

Question 14

A blackbody is an ideal system that

Accepted Answer

A) absorbs 100% of the light incident upon it, but cannot emit light of its own (i.e., a "black" body). 
B) emits 100% of the light it generates, but cannot absorb radiation of its own. 
C) either absorbs 100% of the light incident upon it, or emits 100% of the radiation it generates. 
D) absorbs 50% of the light incident upon it, and emits 50% of the radiation it generates. 
E) absorbs 95% of the light incident upon it, and emits 5% of the radiation it generates. 
A) absorbs 100% of the light incident upon it, but cannot emit light of its own (i.e., a "black" body). 
B) emits 100% of the light it generates, but cannot absorb radiation of its own. 
C) either absorbs 100% of the light incident upon it, or emits 100% of the radiation it generates. 
D) absorbs 50% of the light incident upon it, and emits 50% of the radiation it generates. 
E) absorbs 95% of the light incident upon it, and emits 5% of the radiation it generates.

Question 15

At what peak wavelength does an object at 37°C (98.6°F) radiate?

Accepted Answer

A) 94 × 10-6 m 
B) 9.4 × 10-6 m 
C) 29 × 10-6 m 
D) 7.8 × 10-6 m 
E) 78 × 10-6 m 
A) 94 × 10-6 m 
B) 9.4 × 10-6 m 
C) 29 × 10-6 m 
D) 7.8 × 10-6 m 
E) 78 × 10-6 m

Question 16

Photons of visible wavelengths are shone on a surface starting with one end of the spectrum and gradually proceeding to the other end. When 589 nm is reached, electrons start coming out of the surface. Which of the following is true?

Accepted Answer

A) The spectrum scan started at the blue end. 
B) Electrons would not be ejected at this wavelength for any material. 
C) The spectrum scan started at the red end. 
D) The spectrum scan could have started at either end. 
E) none of the above 
A) The spectrum scan started at the blue end. 
B) Electrons would not be ejected at this wavelength for any material. 
C) The spectrum scan started at the red end. 
D) The spectrum scan could have started at either end. 
E) none of the above

Question 17

A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?

Accepted Answer

A) the red beam 
B) the violet beam 
C) The number of photons per second is the same for both beams. 
D) This cannot be answered without knowing just what the light intensity is. 
A) the red beam 
B) the violet beam 
C) The number of photons per second is the same for both beams. 
D) This cannot be answered without knowing just what the light intensity is.

Question 18

A photon has energy of 4.20 eV. To what wavelength does this energy correspond?

Accepted Answer

A) 321 nm 
B) 103 nm 
C) 296 nm 
D) 412 nm 
E) 420 nm 
A) 321 nm 
B) 103 nm 
C) 296 nm 
D) 412 nm 
E) 420 nm

Question 19

A metal surface is illuminated with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected

Accepted Answer

A) at the same rate, but with more energy per electron. 
B) at the same rate, but with less energy per electron. 
C) at an increased rate with no change in energy per electron. 
D) at a reduced rate with no change in energy per electron. 
A) at the same rate, but with more energy per electron. 
B) at the same rate, but with less energy per electron. 
C) at an increased rate with no change in energy per electron. 
D) at a reduced rate with no change in energy per electron.

Question 20

What is the energy of a photon of wavelength 3 cm?

Accepted Answer

A) 82 eV 
B) 4.1 × 10-5 eV 
C) 41 eV 
D) 4.1 × 10-5 J 
E) 3 ergs 
A) 82 eV 
B) 4.1 × 10-5 eV 
C) 41 eV 
D) 4.1 × 10-5 J 
E) 3 ergs

Exam 37: Early Quantum Theory and Models of the Atom

The ratio of energy to frequency for a given photon gives

What is a photon?

What is the wavelength of a neutron having a kinetic energy of 0.025 eV? (The mass of a neutron is 1.67 × 10-27 kg.)

What advantage might an electron microscope have over a light microscope?

What is the momentum of a photon of light that has a frequency of 2.8 × 1014 Hz?

If a star has a peak intensity at 580 nm, what is its temperature?

As a particle travels faster, its de Broglie wavelength

In the spectrum of white light which one of the following colors corresponds to the highest temperature?

In an electron two-slit experiment, the slits are 15 μm apart. If the first diffraction maximum lies at an angle of 5.0 × 10-7 rad, what is the momentum of the incoming electrons?

Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should

An ideal blackbody absorbs all of the light that is incident on it.

A proton and an electron are both accelerated to the same final kinetic energy. If λp is the de Broglie wavelength of the proton and λ3 is the de Broglie wavelength of the electron, then

Blackbody radiation is from a body that

A blackbody is an ideal system that

At what peak wavelength does an object at 37°C (98.6°F) radiate?

Photons of visible wavelengths are shone on a surface starting with one end of the spectrum and gradually proceeding to the other end. When 589 nm is reached, electrons start coming out of the surface. Which of the following is true?

A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?

A photon has energy of 4.20 eV. To what wavelength does this energy correspond?

A metal surface is illuminated with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected

What is the energy of a photon of wavelength 3 cm?

Introduction, Measurement, Estimating

Describing Motion: Kinematics in One Dimension

Kinematics in Two or Three Dimensions; Vectors

Dynamics: Newtons Laws of Motion

Using Newtons Laws: Friction, Circular Motion, Drag Forces

Gravitation and Newtons6 Synthesis

Work and Energy

Conservation of Energy

Linear Momentum

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Angular Momentum; General Rotation

Static Equilibrium; Elasticity and Fracture

Fluids

Oscillations

Wave Motion

Sound

Temperature, Thermal Expansion, and the Ideal Gas Law

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

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Capacitance, Dielectrics, Electric Energy Storage

Electric Currents and Resistance

Dc Circuits

Magnetism

Sources of Magnetic Field

Electromagnetic Induction and Faradays Law

Inductance, Electromagnetic Oscillations, and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Light: Reflection and Refraction

Lenses and Optical Instruments

The Wave Nature of Light; Interference

Diffraction and Polarization

Special Theory of Relativity

Quantum Mechanics

Quantum Mechanics of Atoms

Molecules and Solids

Nuclear Physics and Radioactivity

Nuclear Energy: Efects and Uses of Radiation

Elementary Particle

Astrophysics and Cosmology

Filters

What is the wavelength of a neutron having a kinetic energy of 0.025 eV? (The mass of a neutron is 1.67 × 10^-27 kg.)

What is the momentum of a photon of light that has a frequency of 2.8 × 10¹⁴ Hz?

In an electron two-slit experiment, the slits are 15 μm apart. If the first diffraction maximum lies at an angle of 5.0 × 10^-7 rad, what is the momentum of the incoming electrons?

A proton and an electron are both accelerated to the same final kinetic energy. If λ_p is the de Broglie wavelength of the proton and λ₃ is the de Broglie wavelength of the electron, then