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Q. No.In an experiment on the photoelectric effect, the maximum kinetic energy of the emitted electrons is plotted as a function of the frequency of incident radiation. The graph is:
1.
a straight line with a positive intercept on the \(x\)-axis (frequency)
2.
a straight line with a positive intercept on the \(y\)-axis (kinetic energy)
3.
a parabola
4.
a hyperbola
Subtopic: Photoelectric Effect: Experiment |
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Photons and electrons of the same wavelength are compared. Which one carries larger momentum?
| 1. | photon |
| 2. | electron |
| 3. | neither, since both have equal momenta |
| 4. | it could be either, depending on the energy |
Subtopic: De-broglie Wavelength |
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Light of wavelength \(4000~\mathring{A}\) is incident on a metal whose work function is \(2.0\) eV. The fastest photo-electrons emitted have an energy of:
(Take \(hc=12400\) eV-\(\mathring A\))
1. \(0.5\) eV
2. \(3.1\) eV
3. \(1.1\) eV
4. \(2\) eV
(Take \(hc=12400\) eV-\(\mathring A\))
1. \(0.5\) eV
2. \(3.1\) eV
3. \(1.1\) eV
4. \(2\) eV
Subtopic: Einstein's Photoelectric Equation |
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The light rays having photons of energy \(4.2~\text{eV}\) are falling on a metal surface having a work function of \(2.2~\text{eV}.\) The stopping potential of the surface is:
| 1. | \(2~\text{eV}\) | 2. | \(2~\text{V}\) |
| 3. | \(1.1~\text{V}\) | 4. | \(6.4~\text{V}\) |
Subtopic: Einstein's Photoelectric Equation |
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NEET - 2022
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The threshold frequency of a photoelectric metal is \(\nu_0.\) If the light of frequency \(4\nu_0\) is incident on this metal, then the maximum kinetic energy of emitted electrons will be:
| 1. | \(h\nu_0\) | 2. | \(2h\nu_0\) |
| 3. | \(3h\nu_0\) | 4. | \(4h\nu_0\) |
Subtopic: Einstein's Photoelectric Equation |
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NEET - 2022
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In a photoelectric experiment, blue light is capable of ejecting a photoelectron from a specific metal while green light is not able to eject a photoelectron. Ejection of photoelectrons is also possible using light of the colour:
1. yellow
2. red
3. violet
4. orange
Subtopic: Photoelectric Effect: Experiment |
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NEET - 2022
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The graph which shows the variation of de Broglie wavelength \((\lambda)\) of a particle and its associated momentum \((p)\) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: De-broglie Wavelength |
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NEET - 2022
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A source of light is placed at a distance of \(50\) cm from a photocell and the stopping potential is found to be \(V_0\). If the distance between the light source and photocell is made \(25\) cm, the new stopping potential will be:
| 1. | \(V_0 /2\) | 2. | \(V_0 \) |
| 3. | \(4V_0 \) | 4. | \(2V_0 \) |
Subtopic: Photoelectric Effect: Experiment |
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NEET - 2013
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A monochromatic source of light emits \(50~\text{W}\) at a wavelength of \(400~\text{nm}\). The number of photons emitted per second is approximately (Take \(\text{hc} = 1240~\text{eV-nm}\)):
1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
Subtopic: Particle Nature of Light |
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A metallic ball (work function: \(2\) eV) is irradiated with light consisting of photons of wavelength \(200\) nm. The ball has an initial charge, giving it a potential \(1\) V. Take the product of Planck's constant and velocity of light, hc as \(1240\) eV-nm. The final potential of the ball, when photoemission practically stops, is:
1. \(2\) V
2. \(3.2\) V
3. \(4.2\) V
4. \(5.2\) V
1. \(2\) V
2. \(3.2\) V
3. \(4.2\) V
4. \(5.2\) V
Subtopic: Photoelectric Effect: Experiment |
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