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Q. No.If \(c\) is the velocity of light in free space, the correct statements about photon 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, \(p={\large\frac{h\nu}{c}}.\)
D.
In a photon-electron collision, both total energy and total momentum are conserved.
E.
Photon possesses positive charge.
Choose the correct answer from the options given below:
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: Â Particle Nature of Light |
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NEET - 2024
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The graph which shows the variation of \(\bigg({\large\frac{1}{\lambda^2}}\bigg)\) and its kinetic energy, \(E\) is (where \(\lambda\) is de-Broglie wavelength of a free particle):
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â De-broglie Wavelength |
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NEET - 2024
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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 \(c=3\times10^{8}~\text{ms}^{-1}\)]:
1. \(4.4~\text{eV}\)
2. \(7.103\times10^{-15}~\text{J}\)
3. \(1.9~\text{eV}\)
4. \(4.60~\text{eV}\)
1. \(4.4~\text{eV}\)
2. \(7.103\times10^{-15}~\text{J}\)
3. \(1.9~\text{eV}\)
4. \(4.60~\text{eV}\)
Subtopic: Â Einstein's Photoelectric Equation |
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From NCERT
NEET - 2024
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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: Â De-broglie Wavelength |
From NCERT
NEET - 2024
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An electron and an alpha particle are accelerated by the same potential difference. Let \(\lambda_\mathrm{e}\) and \(\lambda_\mathrm{\alpha}\) denote the de Broglie wavelengths of the electron and the alpha particle, respectively, then:
1. \(\lambda_{\mathrm{e}}>\lambda_{\alpha}\)
2. \(\lambda_{\mathrm{e}}=4\lambda_{\alpha}\)
3. \(\lambda_{\mathrm{e}}=\lambda_{\alpha}\)
4. \(\lambda_{\mathrm{e}}<\lambda_{\alpha}\)
1. \(\lambda_{\mathrm{e}}>\lambda_{\alpha}\)
2. \(\lambda_{\mathrm{e}}=4\lambda_{\alpha}\)
3. \(\lambda_{\mathrm{e}}=\lambda_{\alpha}\)
4. \(\lambda_{\mathrm{e}}<\lambda_{\alpha}\)
Subtopic: Â De-broglie Wavelength |
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NEET - 2024
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If \(\phi\) is the work function of photosensitive material in \(\text{eV}\) and light of wavelength of numerical value \(\lambda=\frac{{hc}}{{e}}\) metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take h-Plank's constant, c-velocity of light in free space) is (in SI units):
1. \({e}+2\phi \)
2. \(2{e}-\phi \)
3. \({e}-\phi \)
4. \({e}+\phi \)
1. \({e}+2\phi \)
2. \(2{e}-\phi \)
3. \({e}-\phi \)
4. \({e}+\phi \)
Subtopic: Â Einstein's Photoelectric Equation |
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NEET - 2024
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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
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 |
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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 |
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From NCERT
NEET - 2022
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