The radius of a star is 6.95 × 108 m,and its rate of radiation has been measured to be 5.32 × 1026 W.Assuming that it is a perfect emitter,what is the temperature of the surface of this star? (σ = 5.67 × 10-8 W/m2 ∙ K4)

A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K

For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

A) 320 nm B) 330 nm C) 340 nm D) 350 nm A) 320 nm B) 330 nm C) 340 nm D) 350 nm

Exam 27: Quantum Optics

A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm.He has heated the plate to 900 K.If the emissivity of the plate is 0.75,at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings.(σ = 5.67 × 10^-8 W/m² ∙ K⁴)

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Question 1

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X-rays of energy 3.5 x $10^4$ eV scatter through an angle of 105° off of a free electron.What is the energy (in eV)of the scattered x-rays? (m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

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Question 2

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3.2 × 10⁴_eV

X-rays with a wavelength of 0.00100 nm are scattered at 130° by free electrons.What is the kinetic energy of each recoil electron? (1 eV = 1.60 × 10^-19 J,m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

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Question 3

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What is the momentum of a photon of light that has a wavelength of 480 nm? $( h = 6.626 \times 10 ^{- 34} \mathrm {~J} \cdot \mathrm { s } )$

(Multiple Choice)

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Question 4

The work function of a particular metal is $4.20 \times 10 ^{- 19} \mathrm {~J}$ What is the photoelectric cutoff (threshold)wavelength for this metal? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 5

The work function of a certain metal is 1.90 eV.What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 6

A metal has a work function of 4.50 eV.Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal.(1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 7

A photon of blue light and a photon of red light are traveling in vacuum.The photon of blue light

(Multiple Choice)

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Question 8

The radius of a star is 6.95 × 10⁸ m,and its rate of radiation has been measured to be 5.32 × 10²⁶ W.Assuming that it is a perfect emitter,what is the temperature of the surface of this star? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

(Multiple Choice)

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Question 9

For what wavelength does a 100-mW laser beam deliver 1.6 × 10¹⁷ photons in one second? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 10

A photon scatters off of a stationary electron.Which of the following statements about the photon are true? (There could be more than one correct choice.)

(Multiple Choice)

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Question 11

What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

(Short Answer)

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Question 12

A certain photon,after being scattered from a free electron that was at rest,moves at an angle of 120° with respect to the incident direction.If the wavelength of the incident photon is 0.591 nm, what is the wavelength of the scattered photon? $\left( m _ { \text {electron } } = 9.11 \times 10 ^ { - 31 } \mathrm {~kg} , \right.$ $c = 3.00 \times 10^8 \mathrm {~m} / \mathrm { s }$ $h = 6.626 \times 10^{ - 34} \mathrm {~J} \cdot \mathrm { s } )$

(Multiple Choice)

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Question 13

A photoelectric surface has a work function of 2.10 eV.Calculate the maximum kinetic energy,in eV,of electrons ejected from this surface by electromagnetic radiation of wavelength 356 nm.(1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Short Answer)

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Question 14

How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

(Multiple Choice)

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Question 15

Photon A has twice the momentum of photon B as both of them are traveling in vacuum.Which statements about these photons are correct? (There could be more than one correct choice.)

(Multiple Choice)

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Question 16

A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV.If a 1.0-V stopping potential is required to make the electron current zero,what is the wavelength of light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

(Multiple Choice)

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Question 17

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 things will also increase?

(Multiple Choice)

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Question 18

A beam of light falling on a metal surface is causing electrons to be ejected from the surface.If we now double the frequency of the light,which of the following statements are correct? (There could be more than one correct choice.)

(Multiple Choice)

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Question 19

A giant star radiates energy at the rate of 3.0 × 10³⁰ W,and its surface temperature has been measured to be 3000 K.Assuming that it is a perfect emitter,what is the radius of this star?(σ = 5.67 × 10^-8 W/m² ∙ K⁴)

(Multiple Choice)

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Question 20

Showing 1 - 20 of 100

Exam 27: Quantum Optics

A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm.He has heated the plate to 900 K.If the emissivity of the plate is 0.75,at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings.(σ = 5.67 × 10-8 W/m2 ∙ K4)

X-rays of energy 3.5 x 10410^4104 eV scatter through an angle of 105° off of a free electron.What is the energy (in eV)of the scattered x-rays? (melectron = 9.11 × 10-31 kg,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

X-rays with a wavelength of 0.00100 nm are scattered at 130° by free electrons.What is the kinetic energy of each recoil electron? (1 eV = 1.60 × 10-19 J,melectron = 9.11 × 10-31 kg,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

What is the momentum of a photon of light that has a wavelength of 480 nm? (h=6.626×10−34 J⋅s)( h = 6.626 \times 10 ^{- 34} \mathrm {~J} \cdot \mathrm { s } )(h=6.626×10−34 J⋅s)

The work function of a particular metal is 4.20×10−19 J4.20 \times 10 ^{- 19} \mathrm {~J}4.20×10−19 J What is the photoelectric cutoff (threshold)wavelength for this metal? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

The work function of a certain metal is 1.90 eV.What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

A metal has a work function of 4.50 eV.Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal.(1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

A photon of blue light and a photon of red light are traveling in vacuum.The photon of blue light

The radius of a star is 6.95 × 108 m,and its rate of radiation has been measured to be 5.32 × 1026 W.Assuming that it is a perfect emitter,what is the temperature of the surface of this star? (σ = 5.67 × 10-8 W/m2 ∙ K4)

For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

A photon scatters off of a stationary electron.Which of the following statements about the photon are true? (There could be more than one correct choice.)

What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

A photoelectric surface has a work function of 2.10 eV.Calculate the maximum kinetic energy,in eV,of electrons ejected from this surface by electromagnetic radiation of wavelength 356 nm.(1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (σ = 5.67 × 10-8 W/m2 ∙ K4)

Photon A has twice the momentum of photon B as both of them are traveling in vacuum.Which statements about these photons are correct? (There could be more than one correct choice.)

A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV.If a 1.0-V stopping potential is required to make the electron current zero,what is the wavelength of light? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 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 things will also increase?

A beam of light falling on a metal surface is causing electrons to be ejected from the surface.If we now double the frequency of the light,which of the following statements are correct? (There could be more than one correct choice.)

A giant star radiates energy at the rate of 3.0 × 1030 W,and its surface temperature has been measured to be 3000 K.Assuming that it is a perfect emitter,what is the radius of this star?(σ = 5.67 × 10-8 W/m2 ∙ K4)

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Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

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First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Magnetism

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A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm.He has heated the plate to 900 K.If the emissivity of the plate is 0.75,at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings.(σ = 5.67 × 10^-8 W/m² ∙ K⁴)

X-rays of energy 3.5 x $10^4$ eV scatter through an angle of 105° off of a free electron.What is the energy (in eV)of the scattered x-rays? (m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

X-rays with a wavelength of 0.00100 nm are scattered at 130° by free electrons.What is the kinetic energy of each recoil electron? (1 eV = 1.60 × 10^-19 J,m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

What is the momentum of a photon of light that has a wavelength of 480 nm? $( h = 6.626 \times 10 ^{- 34} \mathrm {~J} \cdot \mathrm { s } )$

The work function of a particular metal is $4.20 \times 10 ^{- 19} \mathrm {~J}$ What is the photoelectric cutoff (threshold)wavelength for this metal? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

The work function of a certain metal is 1.90 eV.What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

A metal has a work function of 4.50 eV.Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal.(1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

The radius of a star is 6.95 × 10⁸ m,and its rate of radiation has been measured to be 5.32 × 10²⁶ W.Assuming that it is a perfect emitter,what is the temperature of the surface of this star? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

For what wavelength does a 100-mW laser beam deliver 1.6 × 10¹⁷ photons in one second? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A photoelectric surface has a work function of 2.10 eV.Calculate the maximum kinetic energy,in eV,of electrons ejected from this surface by electromagnetic radiation of wavelength 356 nm.(1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV.If a 1.0-V stopping potential is required to make the electron current zero,what is the wavelength of light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A giant star radiates energy at the rate of 3.0 × 10³⁰ W,and its surface temperature has been measured to be 3000 K.Assuming that it is a perfect emitter,what is the radius of this star?(σ = 5.67 × 10^-8 W/m² ∙ K⁴)