What is the surface temperature of a star,if its radiation peak occurs at a frequency of 1.06 × 1015 Hz? (c = 3.00 × 108 m/s,and the constant in Wien's law is 0.00290 m ∙ K)

A) 17,000 K B) 14,500 K C) 19,000 K D) 20,400 K E) 10,200 K A) 17,000 K B) 14,500 K C) 19,000 K D) 20,400 K E) 10,200 K

Exam 27: Quantum Optics

What are the wavelength and the corresponding photon energy (in electron-volts)of the primary light emitted by an ideal blackbody at each of the following temperatures? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J,and the constant in Wein's law is 0.00290 m ∙ K) (a)400°C? (b)800°C? (c)1200°C?

(Short Answer)

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Question 21

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)

(Multiple Choice)

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Question 22

A helium-neon laser emits light at 632.8 nm.If the laser emits $1.82 \times 10^{17}$ photons/second,what is its power output in mW? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 23

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

(Short Answer)

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Question 24

X-rays of wavelength 0.20 nm are scattered by a free electron.The change in the wavelength of the x-rays is observed to be 2.0 × 10^-12 m at a certain scattering angle measured relative to the incoming x-ray direction.What is the scattering angle of the x-rays? (m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 25

What is the longest wavelength of electromagnetic radiation that will eject photoelectrons from sodium metal for which the work function is 2.28 eV? (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 26

When light of wavelength 350 nm is incident on a metal surface,the stopping potential of the photoelectrons is measured to be 0.500 V.What is the work function of this metal? (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 27

A beam of x-rays at a certain wavelength are scattered from a free electron that is at rest,and the scattered beam is observed at 45.0° from the incident beam.What is the change in the wavelength of the x-rays during this process? (m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 28

The cylindrical filament in a light bulb has a diameter of 0.050 mm,an emissivity of 1.0,and a temperature of 3000°C.How long should the filament be in order to radiate 60 W of power? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

(Multiple Choice)

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Question 29

A metallic surface is illuminated with light of wavelength 400 nm.If the work function for this metal is 2.40 eV,what is the maximum kinetic energy of the ejected electrons,in electron-volts? (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 30

What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ∙ K.

(Multiple Choice)

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Question 31

An 18.0 pm wavelength photon is scattered by a stationary electron through an angle of 120°.What is the wavelength of the scattered photon? (m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 32

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

(Multiple Choice)

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Question 33

In an electric furnace used for refining steel,the temperature is monitored by measuring the radiant power emitted through a small hole in the wall of the furnace,of area 0.5 cm².This hole acts like a perfect blackbody radiator having the same temperature as the interior of the furnace.If the temperature of the furnace (and therefore of the hole)is to be maintained at 1650°C,how much power will the hole radiate?

(Multiple Choice)

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Question 34

If the absolute temperature of an object is tripled,the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change)will

(Multiple Choice)

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Question 35

What is the surface temperature of a star,if its radiation peak occurs at a frequency of 1.06 × 10¹⁵ Hz? (c = 3.00 × 10⁸ m/s,and the constant in Wien's law is 0.00290 m ∙ K)

(Multiple Choice)

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Question 36

Which of the following actions will increase the energy of a photon? (There could be more than one correct choice.)

(Multiple Choice)

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Question 37

An object having a fixed emissivity of 0.725 radiates heat at a rate of 10 W when it is at an absolute temperature T.If its temperature is doubled to 2T,at what rate will it now radiate?

(Multiple Choice)

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Question 38

Gamma rays are photons with very high energy.How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy $4.1 \times 10^{ - 13} \mathrm {~J} ?$

(Multiple Choice)

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Question 39

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10^-13 J? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 40

Showing 21 - 40 of 100

Exam 27: Quantum Optics

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)

A helium-neon laser emits light at 632.8 nm.If the laser emits 1.82×10171.82 \times 10^{17} 1.82×1017 photons/second,what is its power output in mW? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

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

What is the longest wavelength of electromagnetic radiation that will eject photoelectrons from sodium metal for which the work function is 2.28 eV? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

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

The cylindrical filament in a light bulb has a diameter of 0.050 mm,an emissivity of 1.0,and a temperature of 3000°C.How long should the filament be in order to radiate 60 W of power? (σ = 5.67 × 10-8 W/m2 ∙ K4)

A metallic surface is illuminated with light of wavelength 400 nm.If the work function for this metal is 2.40 eV,what is the maximum kinetic energy of the ejected electrons,in electron-volts? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ∙ K.

An 18.0 pm wavelength photon is scattered by a stationary electron through an angle of 120°.What is the wavelength of the scattered photon? (melectron = 9.11 × 10-31 kg,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

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

If the absolute temperature of an object is tripled,the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change)will

What is the surface temperature of a star,if its radiation peak occurs at a frequency of 1.06 × 1015 Hz? (c = 3.00 × 108 m/s,and the constant in Wien's law is 0.00290 m ∙ K)

Which of the following actions will increase the energy of a photon? (There could be more than one correct choice.)

An object having a fixed emissivity of 0.725 radiates heat at a rate of 10 W when it is at an absolute temperature T.If its temperature is doubled to 2T,at what rate will it now radiate?

Gamma rays are photons with very high energy.How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy 4.1×10−13 J?4.1 \times 10^{ - 13} \mathrm {~J} ?4.1×10−13 J?

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10-13 J? (c = 3.0 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

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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)

A helium-neon laser emits light at 632.8 nm.If the laser emits $1.82 \times 10^{17}$ photons/second,what is its power output in mW? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

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

What is the longest wavelength of electromagnetic radiation that will eject photoelectrons from sodium metal for which the work function is 2.28 eV? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19 J)

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

The cylindrical filament in a light bulb has a diameter of 0.050 mm,an emissivity of 1.0,and a temperature of 3000°C.How long should the filament be in order to radiate 60 W of power? (σ = 5.67 × 10^-8 W/m² ∙ K⁴)

A metallic surface is illuminated with light of wavelength 400 nm.If the work function for this metal is 2.40 eV,what is the maximum kinetic energy of the ejected electrons,in electron-volts? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

An 18.0 pm wavelength photon is scattered by a stationary electron through an angle of 120°.What is the wavelength of the scattered photon? (m_electron = 9.11 × 10^-31 kg,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

What is the surface temperature of a star,if its radiation peak occurs at a frequency of 1.06 × 10¹⁵ Hz? (c = 3.00 × 10⁸ m/s,and the constant in Wien's law is 0.00290 m ∙ K)

Gamma rays are photons with very high energy.How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy $4.1 \times 10^{ - 13} \mathrm {~J} ?$

Gamma rays are photons with very high energy.What is the wavelength of a gamma-ray photon with energy 7.7 × 10^-13 J? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)