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11TH GRADE PRACTICE

Physics Problems: Quantum physics, Grade 11

Photons and the photoelectric effect.

17 problems1 subtopics
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CONDITIONS

Problems

17
№ 61

Problem 61

Quantum physics and photoelectric effect

Determine the energy, equivalent mass, and momentum of a violet photon with wavelength 4⋅10−7 m4\cdot10^{-7}\,\text{m}.

  1. (1⋅10−18 Dzh; 1,1⋅10−35 kg; 3,3⋅10−27 kg⋅m/s)\left(1 \cdot 10^{-18}\,\text{Dzh};\ 1{,}1 \cdot 10^{-35}\,\text{kg};\ 3{,}3 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s}\right)
  2. (5⋅10−18 Dzh; 5,5⋅10−35 kg; 1,65⋅10−26 kg⋅m/s)\left(5 \cdot 10^{-18}\,\text{Dzh};\ 5{,}5 \cdot 10^{-35}\,\text{kg};\ 1{,}65 \cdot 10^{-26}\,\text{kg}\cdot\text{m/s}\right)
  3. (5⋅10−19 Dzh; 5,5⋅10−36 kg; 1,65⋅10−27 kg⋅m/s)\left(5 \cdot 10^{-19}\,\text{Dzh};\ 5{,}5 \cdot 10^{-36}\,\text{kg};\ 1{,}65 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s}\right)
  4. (2,5⋅10−19 Dzh; 2,75⋅10−36 kg; 8,25⋅10−28 kg⋅m/s)\left(2{,}5 \cdot 10^{-19}\,\text{Dzh};\ 2{,}75 \cdot 10^{-36}\,\text{kg};\ 8{,}25 \cdot 10^{-28}\,\text{kg}\cdot\text{m/s}\right)
№ 62

Problem 62

Quantum physics and photoelectric effect

Will a photoelectric effect be observed in potassium under illumination with a frequency of 6⋅1014 Hz6\cdot10^{14}\,\text{Hz} if the work function is greater than the photon energy?

  1. Da, vsegda pri vidimom svete\text{Da, vsegda pri vidimom svete}
  2. Da, esli uvelichit intensivnost\text{Da, esli uvelichit intensivnost}
  3. Net, potomu chto chastota slishkom velika\text{Net, potomu chto chastota slishkom velika}
  4. Net, energii fotona nedostatochno\text{Net, energii fotona nedostatochno}
№ 63

Problem 63

Quantum physics and photoelectric effect

For the previous problem, assume the work function is 2,2 eV2{,}2\,\text{eV}. Determine the maximum kinetic energy and speed of photoelectrons, the retardation voltage, and the red limit of the photoelectric effect.

  1. (4,4⋅10−20 Dzh; 3,1⋅105 m/s; 0,275 V; 5,6⋅10−7 m)\left(4{,}4 \cdot 10^{-20}\,\text{Dzh};\ 3{,}1 \cdot 10^{5}\,\text{m/s};\ 0{,}275\,\text{V};\ 5{,}6 \cdot 10^{-7}\,\text{m}\right)
  2. (2,2⋅10−20 Dzh; 1,55⋅105 m/s; 0,1375 V; 2,8⋅10−7 m)\left(2{,}2 \cdot 10^{-20}\,\text{Dzh};\ 1{,}55 \cdot 10^{5}\,\text{m/s};\ 0{,}1375\,\text{V};\ 2{,}8 \cdot 10^{-7}\,\text{m}\right)
  3. (8,8⋅10−20 Dzh; 6,2⋅105 m/s; 0,55 V; 1,12⋅10−6 m)\left(8{,}8 \cdot 10^{-20}\,\text{Dzh};\ 6{,}2 \cdot 10^{5}\,\text{m/s};\ 0{,}55\,\text{V};\ 1{,}12 \cdot 10^{-6}\,\text{m}\right)
  4. (4,4⋅10−19 Dzh; 3,1⋅106 m/s; 2,75 V; 5,6⋅10−6 m)\left(4{,}4 \cdot 10^{-19}\,\text{Dzh};\ 3{,}1 \cdot 10^{6}\,\text{m/s};\ 2{,}75\,\text{V};\ 5{,}6 \cdot 10^{-6}\,\text{m}\right)
№ 64

Problem 64

Quantum physics and photoelectric effect

The solar radiation power is 4⋅1023 kW4\cdot10^{23}\,\text{kW}. How much does the mass of the Sun decrease per day?

  1. 3,84⋅1012 kg3{,}84 \cdot 10^{12}\,\text{kg}
  2. 3,84⋅1011 kg3{,}84 \cdot 10^{11}\,\text{kg}
  3. 1,92⋅1011 kg1{,}92 \cdot 10^{11}\,\text{kg}
  4. 7,68⋅1011 kg7{,}68 \cdot 10^{11}\,\text{kg}
№ 65

Problem 65

Quantum physics and photoelectric effect

Determine the red limit of the photoelectric effect for zinc at work function 4,2 eV4{,}2\,\text{eV}.

  1. 5,9⋅10−7 m5{,}9 \cdot 10^{-7}\,\text{m}
  2. 2,95⋅10−6 m2{,}95 \cdot 10^{-6}\,\text{m}
  3. 2,95⋅10−7 m2{,}95 \cdot 10^{-7}\,\text{m}
  4. 1,475⋅10−7 m1{,}475 \cdot 10^{-7}\,\text{m}
№ 66

Problem 66

Quantum physics and photoelectric effect

What impulse is transmitted to the mirror by a photon with a wavelength of 2,95⋅10−7 m2{,}95\cdot10^{-7}\,\text{m} during normal reflection?

  1. 2,235⋅10−27 kg⋅m/s2{,}235 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s}
  2. 8,94⋅10−27 kg⋅m/s8{,}94 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s}
  3. 4,47⋅10−26 kg⋅m/s4{,}47 \cdot 10^{-26}\,\text{kg}\cdot\text{m/s}
  4. 4,47⋅10−27 kg⋅m/s4{,}47 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s}
№ 67

Problem 67

Quantum physics and photoelectric effect

The radiation power of the Sun is 4⋅1026 W4\cdot10^{26}\,\text{W}. Determine the flux density of solar radiation on Earth. Distance 1,5⋅1011 m1{,}5\cdot10^{11}\,\text{m}.

  1. 1400 Vt/m21400\,\text{Vt/m}^{2}
  2. 700 Vt/m2700\,\text{Vt/m}^{2}
  3. 2800 Vt/m22800\,\text{Vt/m}^{2}
  4. 14000 Vt/m214000\,\text{Vt/m}^{2}
№ 68

Problem 68

Quantum physics and photoelectric effect

What wavelength of light should be directed onto the tungsten plate so that electrons are emitted at a speed of 8⋅105 m/s8\cdot10^{5}\,\text{m/s}? Determine the red limit and delay voltage when the output operates 4,95 eV4{,}95\,\text{eV}.

  1. (1,96⋅10−6 m; 2,5⋅10−6 m; 18,2 V)\left(1{,}96 \cdot 10^{-6}\,\text{m};\ 2{,}5 \cdot 10^{-6}\,\text{m};\ 18{,}2\,\text{V}\right)
  2. (1,96⋅10−7 m; 2,5⋅10−7 m; 1,82 V)\left(1{,}96 \cdot 10^{-7}\,\text{m};\ 2{,}5 \cdot 10^{-7}\,\text{m};\ 1{,}82\,\text{V}\right)
  3. (9,8⋅10−8 m; 1,25⋅10−7 m; 0,91 V)\left(9{,}8 \cdot 10^{-8}\,\text{m};\ 1{,}25 \cdot 10^{-7}\,\text{m};\ 0{,}91\,\text{V}\right)
  4. (3,92⋅10−7 m; 5⋅10−7 m; 3,64 V)\left(3{,}92 \cdot 10^{-7}\,\text{m};\ 5 \cdot 10^{-7}\,\text{m};\ 3{,}64\,\text{V}\right)
№ 69

Problem 69

Quantum physics and photoelectric effect

The red limit for metal is 5,3⋅1014 Hz5{,}3\cdot10^{14}\,\text{Hz}. Determine the maximum speed of photoelectrons at a wavelength of 5⋅10−7 m5\cdot10^{-7}\,\text{m}. Will there be a photoelectric effect at 6⋅10−7 m6\cdot10^{-7}\,\text{m}?

  1. (3,2⋅105 m/s; fotoeffekta net v oboikh sluchayakh)\left(3{,}2\cdot10^5\,\text{m/s};\ \text{fotoeffekta net v oboikh sluchayakh}\right)
  2. (1,6⋅105 m/s; pri 6⋅10−7 m fotoeffekt est)\left(1{,}6\cdot10^5\,\text{m/s};\ \text{pri }6\cdot10^{-7}\text{ m fotoeffekt est}\right)
  3. (3,2⋅105 m/s; pri 6⋅10−7 m fotoeffekta net)\left(3{,}2\cdot10^5\,\text{m/s};\ \text{pri }6\cdot10^{-7}\text{ m fotoeffekta net}\right)
  4. (6,4⋅105 m/s; fotoeffekt est v oboikh sluchayakh)\left(6{,}4\cdot10^5\,\text{m/s};\ \text{fotoeffekt est v oboikh sluchayakh}\right)
№ 70

Problem 70

Quantum physics and photoelectric effect

At what speed must an electron move so that its momentum is the same as that of a photon with a wavelength of 4⋅10−7 m4\cdot10^{-7}\,\text{m}?

  1. 906,5 m/s906{,}5\,\text{m/s}
  2. 3626 m/s3626\,\text{m/s}
  3. 18130 m/s18130\,\text{m/s}
  4. 1813 m/s1813\,\text{m/s}
№ 71

Problem 71

Quantum physics and photoelectric effect

The wavelength of light in glass is 5⋅10−7 m5\cdot10^{-7}\,\text{m}, the refractive index is 1,51{,}5. What is the wavelength in air and frequency?

  1. (7,5⋅10−7 m; 4⋅1014 Gts)\left(7{,}5 \cdot 10^{-7}\,\text{m};\ 4 \cdot 10^{14}\,\text{Gts}\right)
  2. (3,75⋅10−7 m; 2⋅1014 Gts)\left(3{,}75 \cdot 10^{-7}\,\text{m};\ 2 \cdot 10^{14}\,\text{Gts}\right)
  3. (1,5⋅10−6 m; 8⋅1014 Gts)\left(1{,}5 \cdot 10^{-6}\,\text{m};\ 8 \cdot 10^{14}\,\text{Gts}\right)
  4. (7,5⋅10−6 m; 4⋅1015 Gts)\left(7{,}5 \cdot 10^{-6}\,\text{m};\ 4 \cdot 10^{15}\,\text{Gts}\right)
№ 72

Problem 72

Quantum physics and photoelectric effect

The X-ray tube operates at a voltage of 45 kV45\,\text{kV}. What is the minimum wavelength of X-rays?

  1. 2,75⋅10−10 m2{,}75 \cdot 10^{-10}\,\text{m}
  2. 2,75⋅10−11 m2{,}75 \cdot 10^{-11}\,\text{m}
  3. 1,375⋅10−11 m1{,}375 \cdot 10^{-11}\,\text{m}
  4. 5,5⋅10−11 m5{,}5 \cdot 10^{-11}\,\text{m}
№ 73

Problem 73

Quantum physics and photoelectric effect

The photoelectric effect occurs only when the momentum of the incident photon is not less than 9⋅10−28 kg⋅m/s9\cdot10^{-28}\,\text{kg}\cdot\text{m/s}. At what speed will electrons be ejected if the light frequency is twice the threshold?

  1. 1,54⋅106 m/s1{,}54 \cdot 10^{6}\,\text{m/s}
  2. 7,7⋅106 m/s7{,}7 \cdot 10^{6}\,\text{m/s}
  3. 7,7⋅105 m/s7{,}7 \cdot 10^{5}\,\text{m/s}
  4. 3,85⋅105 m/s3{,}85 \cdot 10^{5}\,\text{m/s}
№ 74

Problem 74

Quantum physics and photoelectric effect

The atom went from a state with an energy of −1,5 eV-1{,}5\,\text{eV} to a state of −5 eV-5\,\text{eV}. Determine the energy, frequency, wavelength, momentum, and equivalent mass of the emitted photon.

  1. (1,75 eV; 4,24⋅1014 Gts; 1,77⋅10−7 m; 6,55⋅10−28 kg⋅m/s; 3,1⋅10−36 kg)\left(1{,}75\,\text{eV};\ 4{,}24 \cdot 10^{14}\,\text{Gts};\ 1{,}77 \cdot 10^{-7}\,\text{m};\ 6{,}55 \cdot 10^{-28}\,\text{kg}\cdot\text{m/s};\ 3{,}1 \cdot 10^{-36}\,\text{kg}\right)
  2. (7 eV; 1,696⋅1015 Gts; 7,08⋅10−7 m; 2,62⋅10−27 kg⋅m/s; 1,24⋅10−35 kg)\left(7\,\text{eV};\ 1{,}696 \cdot 10^{15}\,\text{Gts};\ 7{,}08 \cdot 10^{-7}\,\text{m};\ 2{,}62 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s};\ 1{,}24 \cdot 10^{-35}\,\text{kg}\right)
  3. (35 eV; 8,48⋅1015 Gts; 3,54⋅10−6 m; 1,31⋅10−26 kg⋅m/s; 6,2⋅10−35 kg)\left(35\,\text{eV};\ 8{,}48 \cdot 10^{15}\,\text{Gts};\ 3{,}54 \cdot 10^{-6}\,\text{m};\ 1{,}31 \cdot 10^{-26}\,\text{kg}\cdot\text{m/s};\ 6{,}2 \cdot 10^{-35}\,\text{kg}\right)
  4. (3,5 eV; 8,48⋅1014 Gts; 3,54⋅10−7 m; 1,31⋅10−27 kg⋅m/s; 6,2⋅10−36 kg)\left(3{,}5\,\text{eV};\ 8{,}48 \cdot 10^{14}\,\text{Gts};\ 3{,}54 \cdot 10^{-7}\,\text{m};\ 1{,}31 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s};\ 6{,}2 \cdot 10^{-36}\,\text{kg}\right)
№ 75

Problem 75

Quantum physics and photoelectric effect

Having an energy of −4,5 eV-4{,}5\,\text{eV}, the atom emits a photon with a frequency of 5⋅1014 Hz5\cdot10^{14}\,\text{Hz}. What is the final energy of an atom?

  1. −6,56 eV-6{,}56\,\text{eV}
  2. −3,28 eV-3{,}28\,\text{eV}
  3. −13,12 eV-13{,}12\,\text{eV}
  4. −65,6 eV-65{,}6\,\text{eV}
№ 77

Problem 77

Quantum physics and photoelectric effect

The wavelength of the gas laser is 632,8 nm632{,}8\,\text{nm}. Determine the frequency, energy, momentum, and equivalent mass of the photon.

  1. (9,48⋅1014 Gts; 6,26⋅10−19 Dzh; 2,08⋅10−27 kg⋅m/s; 7⋅10−36 kg)\left(9{,}48 \cdot 10^{14}\,\text{Gts};\ 6{,}26 \cdot 10^{-19}\,\text{Dzh};\ 2{,}08 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s};\ 7 \cdot 10^{-36}\,\text{kg}\right)
  2. (4,74⋅1015 Gts; 3,13⋅10−18 Dzh; 1,04⋅10−26 kg⋅m/s; 3,5⋅10−35 kg)\left(4{,}74 \cdot 10^{15}\,\text{Gts};\ 3{,}13 \cdot 10^{-18}\,\text{Dzh};\ 1{,}04 \cdot 10^{-26}\,\text{kg}\cdot\text{m/s};\ 3{,}5 \cdot 10^{-35}\,\text{kg}\right)
  3. (4,74⋅1014 Gts; 3,13⋅10−19 Dzh; 1,04⋅10−27 kg⋅m/s; 3,5⋅10−36 kg)\left(4{,}74 \cdot 10^{14}\,\text{Gts};\ 3{,}13 \cdot 10^{-19}\,\text{Dzh};\ 1{,}04 \cdot 10^{-27}\,\text{kg}\cdot\text{m/s};\ 3{,}5 \cdot 10^{-36}\,\text{kg}\right)
  4. (2,37⋅1014 Gts; 1,565⋅10−19 Dzh; 5,2⋅10−28 kg⋅m/s; 1,75⋅10−36 kg)\left(2{,}37 \cdot 10^{14}\,\text{Gts};\ 1{,}565 \cdot 10^{-19}\,\text{Dzh};\ 5{,}2 \cdot 10^{-28}\,\text{kg}\cdot\text{m/s};\ 1{,}75 \cdot 10^{-36}\,\text{kg}\right)
№ 90

Problem 90

Quantum physics and photoelectric effect

The ionization energy of the hydrogen atom is 13,6 eV13{,}6\,\text{eV}. Is a photon with a wavelength of 4⋅10−8 m4\cdot10^{-8}\,\text{m} capable of ionizing an atom?

  1. Net, energiya fotona menshe energii ionizatsii\text{Net, energiya fotona menshe energii ionizatsii}
  2. Net, fotony ne ioniziruyut atomy\text{Net, fotony ne ioniziruyut atomy}
  3. Da, no tolko pri udvoenii intensivnosti\text{Da, no tolko pri udvoenii intensivnosti}
  4. Da, energiya fotona bolshe energii ionizatsii\text{Da, energiya fotona bolshe energii ionizatsii}

THEORY

Lessons on the topic

Photons and the photoelectric effectPhoton energy and momentum, photoelectric effect equation and red boundary.

DIRECTORY

Formulas by topic

WorkA · JFrequencyν · HzEnergyE, W · J