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Q. No.A point source of light is used in a photoelectric effect. If the source is removed farther from the emitting metal, the stopping potential:
1.
will increase.
2.
will decrease.
3.
will remain constant.
4.
will either increase or decrease.
Subtopic: Photoelectric Effect: Experiment |
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When the intensity of a light source is increased,
| (a) | the number of photons emitted by the source in unit time increases. |
| (b) | the total energy of the photons emitted per unit time increases. |
| (c) | more energetic photons are emitted. |
| (d) | faster photons are emitted. |
Choose the correct option:
| 1. | (a), (b) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Photoelectric Effect: Experiment |
From NCERT
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Light of wavelength \(\lambda\) falls on a metal having work function \(\dfrac{hc}{\lambda_0}\). The photoelectric effect will take place only if:
1. \(\lambda \geq\lambda_0\)
2. \(\lambda \geq 2\lambda_0\)
3. \(\lambda \leq\lambda_0\)
4. \(\lambda < \dfrac{\lambda_0}{2}\)
Subtopic: Photoelectric Effect: Experiment |
76%
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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 \({hc} = 1240~\text{eV-nm}\)):
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 |
81%
From NCERT
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If the intensity of radiation incident on a photocell is increased four times keeping frequency constant, then the number of photoelectrons and energy of photoelectrons emitted become:
| 1. | four times, doubled |
| 2. | doubled, remains unchanged |
| 3. | remains unchanged, doubled |
| 4. | four times, remains unchanged |
Subtopic: Electron Emission |
85%
From NCERT
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Hints
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Which of the following statements about photons is incorrect?
| 1. | The rest mass of a photon is zero. |
| 2. | The momentum of a photon is given by \(h\nu/c.\) |
| 3. | The energy of a photon is \(h\nu.\) |
| 4. | Photons do not exert any pressure. |
Subtopic: Particle Nature of Light |
77%
From NCERT
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In the de-Broglie equation, wavelength \(\mathit{\lambda}\) depends upon mass \(m\) and energy \(E\) according to the relation represented as:
1. \(mE^{1/2}\)
2. \(m^{-1/2}E^{1/2}\)
3. \(m^{-1/2}E^{-1/2}\)
4. \(m^{1/2}E^{-1/2}\)
1. \(mE^{1/2}\)
2. \(m^{-1/2}E^{1/2}\)
3. \(m^{-1/2}E^{-1/2}\)
4. \(m^{1/2}E^{-1/2}\)
Subtopic: De-broglie Wavelength |
86%
From NCERT
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Ultraviolet photons, each of energy \(20~\text{eV},\) are incident onto a gas of \(\mathrm {H}\)-atoms, causing the emission of electrons. The kinetic energy of the emitted electrons has the value:
1. \(6.4~\text{eV}\)
2. \(7.2~\text{eV}\)
3. \(3.2~\text{eV}\)
4. \(13.6~\text{eV}\)
1. \(6.4~\text{eV}\)
2. \(7.2~\text{eV}\)
3. \(3.2~\text{eV}\)
4. \(13.6~\text{eV}\)
Subtopic: Electron Emission |
68%
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When two monochromatic lights of frequency, \(\nu\) and \(\dfrac{\nu}{2}\) are incident on a photoelectric metal, their stopping potential becomes \(\dfrac{V_{s}}{2}\) and \(V_s\), respectively. The threshold frequency for this metal is:
| 1. | \(\dfrac{3}{2} \nu\) | 2. | \(2\nu\) |
| 3. | \(3\nu\) | 4. | \(\dfrac{2}{3} \nu\) |
Subtopic: Einstein's Photoelectric Equation |
71%
From NCERT
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 |
84%
From NCERT
NEET - 2022
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