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Q. No.If \(c\) is the velocity of light in free space, the correct statements about photons among the following are:
| (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 a positive electric charge. |
| 1. | (A), (B), (C) and (D) only |
| 2. | (A), (C) and (D) only |
| 3. | (A), (B), (D) and (E) only |
| 4. | (A) and (B) only |
Subtopic: Particle Nature of Light |
64%
Level 2: 60%+
NEET - 2024
Hints
The graph that shows the variation of \({\dfrac{1}{\lambda^2}}\) with the kinetic energy \(E\) (where \(\lambda\) is the de-Broglie wavelength of a free particle) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: De-broglie Wavelength |
57%
Level 3: 35%-60%
NEET - 2024
Hints
Radiation of wavelength \(280~\text{nm}\) is used in an experiment of photoelectric effect with cathode of work function, \(2.5~\text{eV}.\) The maximum kinetic energy of the photoelectrons is:
(take \(h=6.62\times10^{-34}~\text{J s}\) and \(c=3\times10^{8}~\text{ms}^{-1}\))
(take \(h=6.62\times10^{-34}~\text{J s}\) and \(c=3\times10^{8}~\text{ms}^{-1}\))
| 1. | \(4.4~\text{eV}\) | 2. | \(7.103\times10^{-15}~\text{J}\) |
| 3. | \(1.9~\text{eV}\) | 4. | \(4.60~\text{eV}\) |
Subtopic: Einstein's Photoelectric Equation |
76%
Level 2: 60%+
NEET - 2024
Hints
Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | The de Broglie wavelength associated with a material particle depends on its charge and nature. |
| Statement II: | The wave nature of particles in sub-atomic domain is significant and measurable. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct. |
Subtopic: De-broglie Wavelength |
Level 3: 35%-60%
NEET - 2024
Hints
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: Photoelectric Effect: Experiment |
69%
Level 2: 60%+
NEET - 2023
Hints
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: De-broglie Wavelength |
58%
Level 3: 35%-60%
NEET - 2023
Hints
The maximum kinetic energy of the emitted photoelectrons in the photoelectric effect is independent of the:
| 1. | work function of material |
| 2. | intensity of incident radiation |
| 3. | frequency of incident radiation |
| 4. | wavelength of incident radiation |
Subtopic: Photoelectric Effect: Experiment |
80%
Level 1: 80%+
NEET - 2023
Hints
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 |
70%
Level 2: 60%+
NEET - 2022
Hints
The graph that shows the variation of the de-Broglie wavelength \((\lambda)\) of a particle and its associated momentum \((p)\) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: De-broglie Wavelength |
84%
Level 1: 80%+
NEET - 2022
Hints
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. | \(\dfrac\lambda2\) | 4. | \(\dfrac\lambda4\) |
Subtopic: De-broglie Wavelength |
63%
Level 2: 60%+
NEET - 2022
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