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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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Light of wavelength \(500~\text{nm}\) is incident on metal with work function \(2.28~\text{eV}\). The de-Broglie wavelength of the emitted electron is:

1. | \(< 2.8\times 10^{-10}~\text{m} \) | 2. | \(< 2.8\times 10^{-9}~\text{m}\) |

3. | \(\geq 2.8\times 10^{-9}~\text{m}\) | 4. | \(\leq 2.8\times 10^{-12}~\text{m}\) |

Subtopic: De-broglie Wavelength |

61%

From NCERT

NEET - 2015

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Radiation of energy \(E\) falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:

(\(c\) = velocity of light)

1. \(E \over c\)

2. \(2E \over c\)

3. \(2E \over c^2\)

4. \(E \over c^2\)

Subtopic: Particle Nature of Light |

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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Which of the following figures represent the variation of the particle momentum and the associated de-Broglie wavelength?

1. | 2. | ||

3. | 4. |

Subtopic: De-broglie Wavelength |

87%

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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If the kinetic energy of the particle is increased to \(16\) times its previous value, the percentage change in the de-Broglie wavelength of the particle is:

1. \(25\)

2. \(75\)

3. \(60\)

4. \(50\)

Subtopic: De-broglie Wavelength |

72%

From NCERT

AIPMT - 2014

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For photoelectric emission from certain metals, the cutoff frequency is \(\nu\). If radiation of frequency \(2\nu\)$\mathrm{}$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be:

(\(m\) is the electron mass)

1. | \(\sqrt{\frac{h\nu}{m}}\) | 2. | \(\sqrt{\frac{2h\nu}{m}}\) |

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

Subtopic: Einstein's Photoelectric Equation |

83%

From NCERT

AIPMT - 2013

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The wavelength \(\lambda_e\) of an electron and \(\lambda_p\) of a photon of the same energy \(E\) are related by:

1. \(\lambda_p \propto \lambda_e\)

2. \(\lambda_p \propto \sqrt{\lambda_e}\)

3. \(\lambda_p \propto \frac{1}{\sqrt{\lambda_e}}\)

4. \(\lambda_p \propto \lambda_e^2\)

1. \(\lambda_p \propto \lambda_e\)

2. \(\lambda_p \propto \sqrt{\lambda_e}\)

3. \(\lambda_p \propto \frac{1}{\sqrt{\lambda_e}}\)

4. \(\lambda_p \propto \lambda_e^2\)

Subtopic: De-broglie Wavelength |

60%

From NCERT

AIPMT - 2013

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A source of light is placed at a distance of \(50\) cm from a photocell and the stopping potential is found to be \(V_0\). If the distance between the light source and photocell is made \(25\) cm, the new stopping potential will be:

1. | \(V_0 /2\) | 2. | \(V_0 \) |

3. | \(4V_0 \) | 4. | \(2V_0 \) |

Subtopic: Photoelectric Effect: Experiment |

74%

From NCERT

NEET - 2013

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