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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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The graph which shows the variation of \(\bigg({\dfrac{1}{\lambda^2}}\bigg)\) 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 |

Â 55%

From NCERT

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. \(4.60~\text{eV}\)

[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: Â Einstein's Photoelectric Equation |

Â 73%

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. |

In the light of the above statements, choose the most appropriate answer from the options given below:

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 |

Â 69%

From NCERT

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 |

Â 75%

From NCERT

NEET - 2024

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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 |

Â 65%

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 |

Â 54%

From NCERT

NEET - 2023

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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 |

Subtopic: Â Photoelectric Effect: Experiment |

Â 76%

From NCERT

NEET - 2023

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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 |

Â 69%

From NCERT

NEET - 2022

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