When two monochromatic lights of frequency, \(\nu\) and \(\frac{\nu}{2}\) are incident on a photoelectric metal, their stopping potential becomes \(\frac{V_{s}}{2}\) and \(V_s\), respectively. The threshold frequency for this metal is:

1. | \(\frac{3}{2} \nu\) | 2. | \(2\nu\) |

3. | \(3\nu\) | 4. | \(\frac{2}{3} \nu\) |

Subtopic: Einstein's Photoelectric Equation |

69%

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: Einstein's Photoelectric Equation |

64%

From NCERT

NEET - 2022

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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: Einstein's Photoelectric Equation |

83%

From NCERT

NEET - 2022

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When the light of frequency \(2\nu_0\) (where \(\nu_0\) is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is \(v_1\). When the frequency of the incident radiation is increased to \(5\nu_0,\) the maximum velocity of electrons emitted from the same plate is \(v_2.\) What will be the ratio of \(v_1\) to \(v_2\)?

1. | \(1:2\) | 2. | \(1:4\) |

3. | \(4:1\) | 4. | \(2:1\) |

Subtopic: Einstein's Photoelectric Equation |

72%

From NCERT

NEET - 2018

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The photoelectric threshold wavelength of silver is \(3250\times 10^{-10}~\text{m}\). What will be the velocity of the electron ejected from a silver surface by the ultraviolet light of wavelength \(2536\times 10^{-10}~\text{m}\)? (Given \(h= 4.14\times 10^{-15}~\text{eVs}\)$$ and $\mathrm{}$\(c= 3\times 10^{8}~\text{m/s}\)${\mathrm{}}^{}$)

1. \(\approx 0.6\times 10^{6}~\text{m/s}\)

2. \(\approx 61\times 10^{3}~\text{m/s}\)

3. \(\approx 0.3\times 10^{6}~\text{m/s}\)

4. \(\approx 0.3\times 10^{5}~\text{m/s}\)

Subtopic: Einstein's Photoelectric Equation |

From NCERT

NEET - 2017

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Photons with energy \(5~\text{eV}\) are incident on a cathode \(C\) in a photoelectric cell. The maximum energy of emitted photoelectrons is \(2~\text{eV}\). When photons of energy \(6~\text{eV}\) are incident on \(C\), no photoelectrons will reach the anode \(A\), if the stopping potential of \(A\) relative to \(C\) is:

1. \(+3~\text{V}\)

2. \(+4~\text{V}\)

3. \(-1~\text{V}\)

4. \(-3~\text{V}\)

Subtopic: Einstein's Photoelectric Equation |

57%

From NCERT

NEET - 2016

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When a metallic surface is illuminated with radiation of wavelength \(\lambda\), the stopping potential is \({V}\). If the same surface is illuminated with radiation of wavelength \(2\lambda\), the stopping potential is \(\frac{{V}}{4}\). The threshold wavelength for the metallic surface is:

1. \(5\lambda\)

2. \(\frac{5}{2} \lambda\)

3. \(3\lambda\)

4. \(4\lambda\)

1. \(5\lambda\)

2. \(\frac{5}{2} \lambda\)

3. \(3\lambda\)

4. \(4\lambda\)

Subtopic: Einstein's Photoelectric Equation |

76%

From NCERT

NEET - 2016

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A photoelectric surface is illuminated successively by the monochromatic light of wavelength \(\lambda\) and \(\frac{\lambda}{2}\). If the maximum kinetic energy of the emitted photoelectrons in the second case is \(3\) times that in the first case, the work function of the surface of the mineral is:

[\(h\) = Plank’s constant, \(c\) = speed of light]

1. \(\frac{hc}{2\lambda}\)

2. \(\frac{hc}{\lambda}\)

3. \(\frac{2hc}{\lambda}\)

4. \(\frac{hc}{3\lambda}\)

Subtopic: Einstein's Photoelectric Equation |

72%

From NCERT

NEET - 2015

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A certain metallic surface is illuminated with monochromatic light of wavelength \(\lambda\). The stopping potential for photoelectric current for this light is \(3V_0\). If the same surface is illuminated with a light of wavelength \(2\lambda\)$\mathrm{}$, the stopping potential is \(V_0\). The threshold wavelength for this surface for the photoelectric effect is:

1. \(6\lambda\)

2. \(4\lambda\)

3. \(\frac{\lambda}{4}\)

4. \(\frac{\lambda}{6}\)

1. \(6\lambda\)

2. \(4\lambda\)

3. \(\frac{\lambda}{4}\)

4. \(\frac{\lambda}{6}\)

Subtopic: Einstein's Photoelectric Equation |

80%

From NCERT

NEET - 2015

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When the energy of the incident radiation is increased by \(20\%\), the kinetic energy of the photoelectrons emitted from a metal surface increases from \(0.5~\text{eV}\) to \(0.8~\text{eV}\). The work function of the metal is:

1. \(0.65~\text{eV}\)

2. \(1.0~\text{eV}\)

3. \(1.3~\text{eV}\)

4. \(1.5~\text{eV}\)

Subtopic: Einstein's Photoelectric Equation |

71%

From NCERT

AIPMT - 2014

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