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A light of wavelength \(\lambda \) is incident on the metal surface and the ejected fastest electron has speed \(v.\) If the wavelength is changed to \(\frac{3\lambda}{4},\) then the speed of the fastest emitted electron will be:

1. | \(\sqrt{\frac{4}{3}}v\) | smaller than

2. | \(\sqrt{\frac{4}{3}}\)\(v\) | greater than

3. | \(2v\) |

4. | zero |

Subtopic: Einstein's Photoelectric Equation |

69%

From NCERT

AIPMT - 1998

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The work function of a metal surface is φ = 1.5 eV. If a light of wavelength 5000 Å falls on it, then the maximum K.E. of the ejected electron will be:

1. | 1.2 eV | 2. | 0.98 eV |

3. | 0.45 eV | 4. | 0 eV |

Subtopic: Einstein's Photoelectric Equation |

80%

From NCERT

AIPMT - 1998

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The current conduction in a discharge tube is due to:

1. electrons only

2. +ve ions and –ve ions

3. –ve ions and electrons

4. +ve ions and electrons

Subtopic: Photoelectric Effect: Experiment |

From NCERT

AIPMT - 1999

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If a light of amplitude A and wavelength λ is incident on a metallic surface, then the saturation current flow is proportional to (assume cut-off wavelength = ${\lambda}_{0}$):

1. ${A}^{2},$ $if$ $\lambda $ $>$ ${\lambda}_{0}$

2. ${A}^{2},$ $if$ $\lambda $ $<$ ${\lambda}_{0}$

3. $A,$ $if$ $\lambda $ $>$ ${\lambda}_{0}$

4. $A,$ $if$ $\lambda $ $<$ ${\lambda}_{0}$

Subtopic: Photoelectric Effect: Experiment |

58%

From NCERT

AIPMT - 1999

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Light of wavelength \(3000 ~{\mathring{\mathrm{A}}}\) in Photoelectric effect gives electron of maximum kinetic energy \(0.5 ~\text{eV}\). If the wavelength changes to \(2000 ~{\mathring{\mathrm{A}}}\) then the maximum kinetic energy of emitted electrons will be:

1. | less than \(0.5 ~\text{eV}\) |

2. | \(0.5 ~\text{eV}\) |

3. | greater than \(0.5 ~\text{eV}\) |

4. | the photoelectric effect does not occur |

Subtopic: Einstein's Photoelectric Equation |

82%

From NCERT

AIPMT - 1999

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If the K.E. of an electron and a photon is the same, then the relation between their de-Broglie wavelength will be:

1. ${\lambda}_{ph}$ $<$ ${\lambda}_{e}$

2. ${\lambda}_{ph}$ $=$ ${\lambda}_{e}$

3. ${\lambda}_{ph}$ $>$ ${\lambda}_{e}$

4. ${\lambda}_{ph}$ $=2$ ${\lambda}_{e}$

Subtopic: De-broglie Wavelength |

52%

From NCERT

AIPMT - 1999

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The total energy of an electron is \(3.555~\text{MeV}\). Its kinetic energy will be:

1. \(3.545~\text{MeV}\)

2. \(3.045~\text{MeV}\)

3. \(3.5~\text{MeV}\)

4. none of the above

Subtopic: Electron Emission |

From NCERT

AIPMT - 1999

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What did Einstein prove by the photo-electric effect?

1. E = h\(\nu\)

2. $KE=\frac{1}{2}m{v}^{2}$

3. $E=m{c}^{2}$

4. $E=\frac{-Rh{c}^{2}}{{n}^{2}}$

Subtopic: Einstein's Photoelectric Equation |

60%

From NCERT

AIPMT - 2000

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Which one among the following shows the particle nature of light?

1. Photoelectric effect

2. Interference

3. Refraction

4. Polarisation

Subtopic: Particle Nature of Light |

90%

From NCERT

AIPMT - 2001

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A photo-cell is illuminated by a source of light, which is placed at a distance \(d\) from the cell. If the distance becomes \(\frac{d}{2}\), then the number of electrons emitted per second will be:

1. same

2. four times

3. two times

4. one-fourth

Subtopic: Photoelectric Effect: Experiment |

71%

From NCERT

AIPMT - 2001

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