Q. No.UV light of \(4.13\) eV is incident on a photosensitive metal surface having work function \(3.13\) eV. The maximum kinetic energy of ejected photoelectrons will be:
1. \(7.26\) eV
2. \(1\) eV
3. \(3.13\) eV
4. \(4.13\) eV
1. \(7.26\) eV
2. \(1\) eV
3. \(3.13\) eV
4. \(4.13\) eV
Subtopic: Einstein's Photoelectric Equation |
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In photoelectric experiment energy of \(2.48 \mathrm{eV}\) irradiates a photo sensitive material. The stopping potential was measured to \(0.5~\mathrm{V}.\) Work function of the photo sensitive material is :
1. \(2.48 \mathrm{eV}\)
2. \(0.5 \mathrm{eV}\)
3. \(1.98 \mathrm{eV}\)
4. \(1.68 \mathrm{eV}\)
1. \(2.48 \mathrm{eV}\)
2. \(0.5 \mathrm{eV}\)
3. \(1.98 \mathrm{eV}\)
4. \(1.68 \mathrm{eV}\)
Subtopic: Einstein's Photoelectric Equation |
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If the work function of a metal is \(6.63~\text{eV},\) then find its threshold frequency for the photoelectric effect.
1. \(1.9\times10^{15}~\text{Hz}\)
2. \(1.6\times10^{15}~\text{Hz}\)
3. \(2\times10^{16}~\text{Hz}\)
4. \(1.2\times10^{15}~\text{Hz}\)
1. \(1.9\times10^{15}~\text{Hz}\)
2. \(1.6\times10^{15}~\text{Hz}\)
3. \(2\times10^{16}~\text{Hz}\)
4. \(1.2\times10^{15}~\text{Hz}\)
Subtopic: Einstein's Photoelectric Equation |
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The work function for a metal is \(4~\text{eV}\). To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should be:
1. \(2700~\mathring A\)
2. \(1700~\mathring{A}\)
3. \(2900~\mathring{A}\)
4. \(3100~\mathring{A}\)
1. \(2700~\mathring A\)
2. \(1700~\mathring{A}\)
3. \(2900~\mathring{A}\)
4. \(3100~\mathring{A}\)
Subtopic: Einstein's Photoelectric Equation |
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The light of two different frequencies whose photons have energies \(3.8~\text{eV}\) and \(1.4~\text{eV}\) respectively, illuminate a metallic surface whose work function is \(0.6~\text{eV}\) successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be:
1. \(1:1\)
2. \(2:1\)
3. \(4:1\)
4. \(1:4\)
1. \(1:1\)
2. \(2:1\)
3. \(4:1\)
4. \(1:4\)
Subtopic: Einstein's Photoelectric Equation |
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When UV light of wavelength 300 nm is incident on the metal surface having work function 2.13 eV, electron emission takes place. The stopping potential is :
1. 4.1 V
2. 2 V
3. 4 V
4. 1.5 V
Subtopic: Einstein's Photoelectric Equation |
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The maximum wavelength of the light source such that photoelectrons can be ejected from the material of work function \(3 ~\text{eV}\) is:
1. \(2133.3 ~\mathring A\)
2. \(3133.3 ~\mathring A\)
3. \(4133.3 ~\mathring A\)
4. \(313.3 ~\mathring A\)
1. \(2133.3 ~\mathring A\)
2. \(3133.3 ~\mathring A\)
3. \(4133.3 ~\mathring A\)
4. \(313.3 ~\mathring A\)
Subtopic: Einstein's Photoelectric Equation |
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In a photoelectric effect experiment, the threshold wavelength of light is \(380~\text{nm}\). If the wavelength of incident light is \(260~\text{nm}\), the maximum kinetic energy of emitted electrons will be:
Given: \(E(\text {in}~\text{eV})=\dfrac{1237}{\lambda(\text {in}~ \text{nm})}\)
1. \(3.0~\text{eV}\)
2. \(1.5~\text{eV}\)
3. \(4.5~\text{eV}\)
4. \(15.1~\text{eV}\)
Subtopic: Einstein's Photoelectric Equation |
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Einstein's photoelectric equation states that \(E_k=h \nu -\phi.\) In this equation \(E_k\) refers to:
| 1. | kinetic energy of all the emitted electrons |
| 2. | mean kinetic energy of the emitted electrons |
| 3. | maximum kinetic energy of the emitted electrons |
| 4. | minimum kinetic energy of the emitted electrons |
Subtopic: Einstein's Photoelectric Equation |
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Which of the following graphs is the variation of stopping potential \((V_s)\) with frequency \((\nu)\) for a photosensitive material correctly shown?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Einstein's Photoelectric Equation |
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