Question 1

A proton has a speed of 7.2 × 104 m/s.The energy of a photon that has the same de Broglie wavelength as the proton is closest to:

Accepted Answer

A) 230 keV 
B) 150 keV 
C) 300 keV 
D) 370 keV 
E) 440 keV 
A) 230 keV 
B) 150 keV 
C) 300 keV 
D) 370 keV 
E) 440 keV

Question 2

A beam of light having frequency greater than the threshold frequency shines on a metal surface.By increasing the intensity of this light,you increase the number of photoelectrons emitted per second from this metal.

Accepted Answer

A) True 
 B)False

Question 3

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10-13 J?

Accepted Answer

A) 2.6 × 10-13 m 
B) 3.9 × 10-13 m 
C) 3.1 × 10-13 m 
D) 3.5 × 10-13 m 
A) 2.6 × 10-13 m 
B) 3.9 × 10-13 m 
C) 3.1 × 10-13 m 
D) 3.5 × 10-13 m

Question 4

When the surface of a metal is exposed to blue light,electrons are emitted.If the intensity of the blue light is increased,which of the following will also increase?

Accepted Answer

A) the number of electrons ejected per second 
B) the maximum kinetic energy of the ejected electrons 
C) the time lag between the onset of the absorption of light and the ejection of electrons 
D) All of the above 
E) Two of the above 
A) the number of electrons ejected per second 
B) the maximum kinetic energy of the ejected electrons 
C) the time lag between the onset of the absorption of light and the ejection of electrons 
D) All of the above 
E) Two of the above

Question 5

Part of the energy level diagram of a certain atom is shown below.The energy spacing between levels 1 and 2 is twice that between 2 and 3.If an electron makes a transition from level 3 to level 2,the radiation of wavelength λ is emitted.   What possible radiation wavelengths might be produced by other transitions between the three energy levels?

Accepted Answer

A) both λ/2 and λ/3 
B) only λ/2 
C) both 2λ and 3λ 
D) only 2λ 
A) both λ/2 and λ/3 
B) only λ/2 
C) both 2λ and 3λ 
D) only 2λ

Question 6

A beam of light having frequency greater than the threshold frequency shines on a metal surface.By increasing the frequency of this light,you increase the number of photoelectrons emitted per second from this metal.

Accepted Answer

A) True 
 B)False

A proton has a speed of 7.2 × 10⁴ m/s.The energy of a photon that has the same de Broglie wavelength as the proton is closest to:

A beam of light having frequency greater than the threshold frequency shines on a metal surface.By increasing the intensity of this light,you increase the number of photoelectrons emitted per second from this metal.

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10^-13 J?

When the surface of a metal is exposed to blue light,electrons are emitted.If the intensity of the blue light is increased,which of the following will also increase?

A beam of light having frequency greater than the threshold frequency shines on a metal surface.By increasing the frequency of this light,you increase the number of photoelectrons emitted per second from this metal.

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Atoms and Molecules

Nuclear Physics

Filters

Exam 28: Quantum Physics

A proton has a speed of 7.2 × 104 m/s.The energy of a photon that has the same de Broglie wavelength as the proton is closest to:

A beam of light having frequency greater than the threshold frequency shines on a metal surface.By increasing the intensity of this light,you increase the number of photoelectrons emitted per second from this metal.

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10-13 J?

When the surface of a metal is exposed to blue light,electrons are emitted.If the intensity of the blue light is increased,which of the following will also increase?

A beam of light having frequency greater than the threshold frequency shines on a metal surface.By increasing the frequency of this light,you increase the number of photoelectrons emitted per second from this metal.

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Atoms and Molecules

Nuclear Physics

Filters

A proton has a speed of 7.2 × 10⁴ m/s.The energy of a photon that has the same de Broglie wavelength as the proton is closest to:

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10^-13 J?