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Q. No.The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:
1.
work function of material
2.
intensity of incident radiation
3.
frequency of incident radiation
4.
wavelength of incident radiation
Subtopic: Â Photoelectric Effect: Experiment |
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From NCERT
NEET - 2023
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The de Broglie wavelength associated with an electron, accelerated by a potential difference of \(81\) V is given by:
1. \(13.6\) nm
2. \(136\) nm
3. \(1.36\) nm
4. \(0.136\) nm
1. \(13.6\) nm
2. \(136\) nm
3. \(1.36\) nm
4. \(0.136\) nm
Subtopic: Â De-broglie Wavelength |
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From NCERT
NEET - 2023
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The work functions of Caesium \((\mathrm{Cs})\), Potassium \((\mathrm{K})\) and Sodium \((\mathrm{Na})\) are \(2.14~\text{eV}\), \(2.30~\text{eV}\) and \(2.75~\text{eV}\) respectively. If incident electromagnetic radiation has an incident energy of \(2.20~\text{eV}\). which of these photosensitive surfaces may emit photoelectrons?
| 1. | \(\mathrm{Na}\) only | 2. | \(\mathrm{Cs}\) only |
| 3. | Both \(\mathrm{Na}\) and \(\mathrm{K}\) | 4. | \(\mathrm{K}\) only |
Subtopic: Â Photoelectric Effect: Experiment |
 65%
From NCERT
NEET - 2023
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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: Â Einstein's Photoelectric Equation |
 83%
From NCERT
NEET - 2022
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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: Â Einstein's Photoelectric Equation |
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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: Â Photoelectric Effect: Experiment |
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From NCERT
NEET - 2022
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The de-Broglie wavelength of the thermal electron at \(27^\circ \text{C}\) is \(\lambda.\) When the temperature is increased to \(927^\circ \text{C},\) its de-Broglie wavelength will become:
1. \(2\lambda\)
2. \(4\lambda\)
3. \(\frac\lambda2\)
4. \(\frac\lambda4\)
Subtopic: Â De-broglie Wavelength |
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From NCERT
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: Â De-broglie Wavelength |
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From NCERT
NEET - 2022
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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: Â Einstein's Photoelectric Equation |
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NEET - 2022
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If \(c\) is the velocity of light in free space, the correct statements about photon among the following are:
Choose the correct answer from the options given below:
1. \(\text {A, B, C}\) and \(\text {D}\) only
2. \(\text {A, C}\) and \(\text {D}\) only
3. \(\text {A, B, D}\) and \(\text {E}\) only
4. \(\text {A}\) and \(\text {B}\) only
| A. | The energy of a photon is \(E=h\nu.\) |
| B. | The velocity of a photon is \(c.\) |
| C. | The momentum of a photon, \(p={\dfrac{h\nu}{c}}.\) |
| D. | In a photon-electron collision, both total energy and total momentum are conserved. |
| E. | Photon possesses positive charge. |
1. \(\text {A, B, C}\) and \(\text {D}\) only
2. \(\text {A, C}\) and \(\text {D}\) only
3. \(\text {A, B, D}\) and \(\text {E}\) only
4. \(\text {A}\) and \(\text {B}\) only
Subtopic: Â Particle Nature of Light |
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From NCERT
NEET - 2024
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