Question 1

The surface temperature of the star is 6000 K.At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ∙ K.

Accepted Answer

A) 850 nm 
B) 907 nm 
C) 311 nm 
D) 483 nm 
E) 502 nm 
A) 850 nm 
B) 907 nm 
C) 311 nm 
D) 483 nm 
E) 502 nm

Question 2

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A) 0.62 × 10-19 J 
B) 0.21 × 10-19 J 
C) 0.36 × 10-19 J 
D) 0.48 × 10-19 J 
E) 0.33 × 10-19 J 
A) 0.62 × 10-19 J 
B) 0.21 × 10-19 J 
C) 0.36 × 10-19 J 
D) 0.48 × 10-19 J 
E) 0.33 × 10-19 J

Question 3

Protons are being accelerated in a particle accelerator.When the energy of the protons is doubled,their de Broglie wavelength will

Accepted Answer

A) increase by a factor of 4. 
B) increase by a factor of 2. 
C) decrease by a factor of 2. 
D) increase by a factor of   . 
E) decrease by a factor of   . 
A) increase by a factor of 4. 
B) increase by a factor of 2. 
C) decrease by a factor of 2. 
D) increase by a factor of   . 
E) decrease by a factor of   .

Question 4

A crystal is irradiated with x-rays with a wavelength of 0.120 nm.The atomic planes in the crystal are separated by 0.21 nm.At what angles of incidence with respect to the normal will the x-rays reflect from the crystal?

Accepted Answer

A) 73°,55°,31° 
B) only 55° 
C) only 73° and 31° 
D) only 73° 
A) 73°,55°,31° 
B) only 55° 
C) only 73° and 31° 
D) only 73°

Question 5

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is 0.500 V.What is the threshold (cutoff)frequency of this metal? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

Accepted Answer

A) 3.47 × 1014 Hz 
B) 3.74 × 1014 Hz 
C) 4.73 × 1014 Hz 
D) 7.36 × 1014 Hz 
A) 3.47 × 1014 Hz 
B) 3.74 × 1014 Hz 
C) 4.73 × 1014 Hz 
D) 7.36 × 1014 Hz

Question 6

Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A) 8.7 × 10-19 J 
B) 3.1 × 10-19 J 
C) 1.3 × 10-19 J 
D) 2.4 × 10-19 J 
E) 4.5 × 10-19 J 
A) 8.7 × 10-19 J 
B) 3.1 × 10-19 J 
C) 1.3 × 10-19 J 
D) 2.4 × 10-19 J 
E) 4.5 × 10-19 J

Question 7

If a proton and an electron have the same de Broglie wavelengths,which one is moving faster?

Accepted Answer

A) the electron 
B) the proton 
C) They both have the same speed. 
A) the electron 
B) the proton 
C) They both have the same speed.

Question 8

Certain planes of a crystal of halite have a spacing of 0.399 nm.The crystal is irradiated by a beam of x-rays.First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface.What angle does the beam make with the crystal planes for second order constructive?

Accepted Answer

A) 37° 
B) 40° 
C) 43° 
D) 46° 
E) 49° 
A) 37° 
B) 40° 
C) 43° 
D) 46° 
E) 49°

The surface temperature of the star is 6000 K.At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ∙ K.

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

Protons are being accelerated in a particle accelerator.When the energy of the protons is doubled,their de Broglie wavelength will

A crystal is irradiated with x-rays with a wavelength of 0.120 nm.The atomic planes in the crystal are separated by 0.21 nm.At what angles of incidence with respect to the normal will the x-rays reflect from the crystal?

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is 0.500 V.What is the threshold (cutoff)frequency of this metal? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

Light with a frequency of 8.70 × 10¹⁴ Hz is incident on a metal that has a work function of 2.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

If a proton and an electron have the same de Broglie wavelengths,which one is moving faster?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

Exam 30: Quantum Physics

The surface temperature of the star is 6000 K.At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ∙ K.

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

Protons are being accelerated in a particle accelerator.When the energy of the protons is doubled,their de Broglie wavelength will

A crystal is irradiated with x-rays with a wavelength of 0.120 nm.The atomic planes in the crystal are separated by 0.21 nm.At what angles of incidence with respect to the normal will the x-rays reflect from the crystal?

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is 0.500 V.What is the threshold (cutoff)frequency of this metal? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J ∙ s)

If a proton and an electron have the same de Broglie wavelengths,which one is moving faster?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is 0.500 V.What is the threshold (cutoff)frequency of this metal? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

Light with a frequency of 8.70 × 10¹⁴ Hz is incident on a metal that has a work function of 2.80 eV.What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)