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Q. No.The work function of a metal surface is \(2\) eV. When the light of frequency \(f\) is incident on the surface, the maximum kinetic energy of the photoelectrons emitted is \(5\) eV. If the frequency of the incident light is increased to \(4f\), then the maximum kinetic energy of the photoelectron emitted will be:
1. \(20\) eV
2. \(22\) eV
3. \(26\) eV
4. \(28\) eV
Subtopic: Einstein's Photoelectric Equation |
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When a point source of monochromatic light is at a distance of \(0.2\) m from a photoelectric cell, the cut-off voltage and saturation current are \(0.6\) volts and \(18\) mA respectively. What will happen if the same source is placed \(0.6\) m away from the photoelectric cell?
| 1. | the stopping potential will be \(0.2\) volts. |
| 2. | the stopping potential will be \(0.6\) volts. |
| 3. | the saturation current will be \(6\) mA. |
| 4. | the saturation current will be \(18\) mA. |
Subtopic: Einstein's Photoelectric Equation |
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The de-Broglie wavelength of an electron is the same as that of a photon of wavelength \(\lambda\). If the mass of an electron is \(m\), then its kinetic energy will be:
1. \(\frac{h^{2} m}{2 \lambda^{2}}\)
2. \(\frac{2 h m^{2}}{\lambda^{2}}\)
3. \(\frac{h^{2} \lambda^{2}}{2 m}\)
4. \(\frac{h^{2}}{2 m \lambda^{2}}\)
1. \(\frac{h^{2} m}{2 \lambda^{2}}\)
2. \(\frac{2 h m^{2}}{\lambda^{2}}\)
3. \(\frac{h^{2} \lambda^{2}}{2 m}\)
4. \(\frac{h^{2}}{2 m \lambda^{2}}\)
Subtopic: De-broglie Wavelength |
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The variation of the kinetic energy \((K)\) of photoelectrons as a function of the frequency \((f)\) of the incident radiation is best shown by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Einstein's Photoelectric Equation |
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On which surface is the electron beam made to fall in the Davisson-Germer experiment?
1. Iron crystals
2. Nickel crystals
3. Gold crystals
4. Cesium crystals
Subtopic: Davisson & Germer Experiment (OLD NCERT) |
68%
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The correct graph between the maximum energy of a photoelectron \(\left(K_{max}\right)\) and the inverse of the wavelength \(\left(\frac{1}{\lambda}\right)\) of the incident radiation is given by the curve:
| 1. | \(A\) | 2. | \(B\) |
| 3. | \(C\) | 4. | None of these |
Subtopic: Einstein's Photoelectric Equation |
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If alpha, beta and gamma rays carry the same momentum, which has the longest wavelength?
| 1. | Alpha rays | 2. | Beta rays |
| 3. | Gamma rays | 4. | None, all have same wavelength |
Subtopic: De-broglie Wavelength |
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The figure shows the variation in photoelectric current \((i)\) with voltage \((V)\) between the electrodes in a photocell for two different radiations. If \(I_a\) and \(I_b\) are the intensities of the incident radiation and \(\nu_a\) and \(\nu_b\) their respective frequencies, then:
| 1. | \(I_a>I_b,~ \nu_b<\nu_a\) | 2. | \(I_a<I_b, ~\nu_b>\nu_a\) |
| 3. | \(I_a>I_b,~ \nu_b=\nu_a\) | 4. | \(I_a<I_b, ~\nu_b<\nu_a\) |
Subtopic: Photoelectric Effect: Experiment |
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The photoelectric effect is used by a photocell to convert:
| 1. | Change in the frequency of light into a change in electric voltage. |
| 2. | Change in the intensity of illumination into a change in photoelectric current. |
| 3. | Change in the intensity of illumination into a change in the work function of the photocathode. |
| 4. | Change in the frequency of light into a change in the electric current. |
Subtopic: Photoelectric Effect: Experiment |
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AIPMT - 2006
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A \(200\) W sodium street lamp emits yellow light of wavelength \(0.6\) . If it is \(25\%\) efficient in converting electrical energy to light, how many photons of yellow light does it emit per second?
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
Subtopic: Particle Nature of Light |
70%
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AIPMT - 2012
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