What is the photon energy of red light having a wavelength of 6.40 × 102 nm? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

A) 1.13 × 10-19 J B) 1.31 × 10-19 J C) 3.11 × 10-19 J D) 1.94 × 10-19 J A) 1.13 × 10-19 J B) 1.31 × 10-19 J C) 3.11 × 10-19 J D) 1.94 × 10-19 J

What is the wavelength of a 6.32-eV photon? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

A) 197 nm B) 167 nm C) 216 nm D) 234 nm A) 197 nm B) 167 nm C) 216 nm D) 234 nm

Exam 27: Quantum Optics

Two sources emit beams of microwaves.The microwaves from source A have a frequency of 10 GHz,and the ones from source B have a frequency of 20 GHz.This is all we know about the two beams.Which of the following statements about these beams are correct? (There could be more than one correct choice.)

(Multiple Choice)

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Question 41

What is the photon energy of red light having a wavelength of 6.40 × 10² nm? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 42

What is the momentum of a photon of light that has a frequency of 2.8 × $10^{14}$ Hz? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , \right.$ $\left. h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

(Multiple Choice)

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Question 43

What is the cutoff (threshold)frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 44

What is the frequency of the most intense radiation from an object with temperature 100°C? The constant in Wien's law is 0.0029 m ∙ K.(c = 3.0 × 10⁸ m/s)

(Multiple Choice)

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Question 45

A 29.0-pm-wavelength photon is scattered by a stationary electron.What is the maximum energy loss the photon can have? (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)

(Multiple Choice)

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Question 46

When it is struck by 240-nm photons,a material having a work function of 2.60 eV emits electrons.What is the maximum kinetic energy of the emitted electrons? (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 47

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW.If the wavelength of the laser light is 642 nm,how many photons does it emit per second? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Short Answer)

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Question 48

If the frequency of a light beam is doubled,what happens to the momentum of the photons in that beam of light?

(Multiple Choice)

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Question 49

What is the wavelength of a 6.32-eV photon? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19J)

(Multiple Choice)

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Question 50

When it is struck by 240-nm photons,a metal ejects electrons with a maximum kinetic energy of $2.58 \mathrm { eV }$ What is the work function of this material? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 16.0 × 10^-19 J)

(Multiple Choice)

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Question 51

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.

(Multiple Choice)

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Question 52

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 maximum kinetic energy of these electrons? (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 53

A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV.What is the threshold (cutoff)frequency for photoelectron production? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 54

The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10^-18 W.How many photons arrive each second? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

(Short Answer)

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Question 55

A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV.What is the wavelength of this 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 56

What frequency of electromagnetic radiation has photons of energy 4.7 × 10^-25 J? (h = 6.626 × 10^-34 J ∙ s)

(Multiple Choice)

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Question 57

When a metal is illuminated by light,photoelectrons are observed provided that the wavelength of the light is less than 520 nm.What is the metal's work function? (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 58

What is the energy (in eV)of an optical photon of frequency $6.43 \times 10 ^ { 14 } \mathrm {~Hz}$ (h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

(Multiple Choice)

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Question 59

A metal surface has a work function of 2.50 eV.What is the longest wavelength of light that will eject electrons from the surface of this metal? (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 60

Showing 41 - 60 of 100

Exam 27: Quantum Optics

Two sources emit beams of microwaves.The microwaves from source A have a frequency of 10 GHz,and the ones from source B have a frequency of 20 GHz.This is all we know about the two beams.Which of the following statements about these beams are correct? (There could be more than one correct choice.)

What is the photon energy of red light having a wavelength of 6.40 × 102 nm? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

What is the cutoff (threshold)frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J ∙ s)

What is the frequency of the most intense radiation from an object with temperature 100°C? The constant in Wien's law is 0.0029 m ∙ K.(c = 3.0 × 108 m/s)

A 29.0-pm-wavelength photon is scattered by a stationary electron.What is the maximum energy loss the photon can have? (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)

When it is struck by 240-nm photons,a material having a work function of 2.60 eV emits electrons.What is the maximum kinetic energy of the emitted electrons? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW.If the wavelength of the laser light is 642 nm,how many photons does it emit per second? (c = 3.0 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

If the frequency of a light beam is doubled,what happens to the momentum of the photons in that beam of light?

What is the wavelength of a 6.32-eV photon? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

When it is struck by 240-nm photons,a metal ejects electrons with a maximum kinetic energy of 2.58eV2.58 \mathrm { eV }2.58eV What is the work function of this material? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 16.0 × 10-19 J)

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.

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 maximum kinetic energy of these electrons? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV.What is the threshold (cutoff)frequency for photoelectron production? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J ∙ s)

The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W.How many photons arrive each second? (c = 3.0 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV.What is the wavelength of this light? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

What frequency of electromagnetic radiation has photons of energy 4.7 × 10-25 J? (h = 6.626 × 10-34 J ∙ s)

When a metal is illuminated by light,photoelectrons are observed provided that the wavelength of the light is less than 520 nm.What is the metal's work function? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

What is the energy (in eV)of an optical photon of frequency 6.43×1014 Hz6.43 \times 10 ^ { 14 } \mathrm {~Hz}6.43×1014 Hz (h = 6.626 × 10-34 J ∙ s,1 eV = 1.60 × 10-19 J)

A metal surface has a work function of 2.50 eV.What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J ∙ s)

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What is the photon energy of red light having a wavelength of 6.40 × 10² nm? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

What is the cutoff (threshold)frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

What is the frequency of the most intense radiation from an object with temperature 100°C? The constant in Wien's law is 0.0029 m ∙ K.(c = 3.0 × 10⁸ m/s)

A 29.0-pm-wavelength photon is scattered by a stationary electron.What is the maximum energy loss the photon can have? (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)

When it is struck by 240-nm photons,a material having a work function of 2.60 eV emits electrons.What is the maximum kinetic energy of the emitted electrons? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW.If the wavelength of the laser light is 642 nm,how many photons does it emit per second? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

What is the wavelength of a 6.32-eV photon? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19J)

When it is struck by 240-nm photons,a metal ejects electrons with a maximum kinetic energy of $2.58 \mathrm { eV }$ What is the work function of this material? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 16.0 × 10^-19 J)

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 maximum kinetic energy of these electrons? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-1⁹ J)

A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV.What is the threshold (cutoff)frequency for photoelectron production? (1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10^-18 W.How many photons arrive each second? (c = 3.0 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV.What is the wavelength of this light? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19 J)

What frequency of electromagnetic radiation has photons of energy 4.7 × 10^-25 J? (h = 6.626 × 10^-34 J ∙ s)

When a metal is illuminated by light,photoelectrons are observed provided that the wavelength of the light is less than 520 nm.What is the metal's work function? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

What is the energy (in eV)of an optical photon of frequency $6.43 \times 10 ^ { 14 } \mathrm {~Hz}$ (h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A metal surface has a work function of 2.50 eV.What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10^-19 J,c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)