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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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A photosensitive metallic surface has a work function of hν_{0}. If photons of energy 2hν_{0} fall on this surface, the electrons come out with a maximum velocity of 4 × 10^{6} m/s. When the photon energy is increased to 5hν_{0}, then the maximum velocity of photoelectrons will be:

1. 2 ×10^{7} m/s

2. 2 × 10^{6} m/s

3. 8 × 10^{5} m/s

4. 8 × 10^{6} m/s

Subtopic: Einstein's Photoelectric Equation |

77%

From NCERT

AIPMT - 2005

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According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is:

1. | 2. | ||

3. | 4. |

Subtopic: Einstein's Photoelectric Equation |

77%

From NCERT

AIPMT - 2004

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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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The value of Planck's constant is:

1. $6.63\times {10}^{-34}$ $\mathrm{J}/\mathrm{s}$

2. $6.63\times {10}^{-34}$ $\mathrm{kg}-{\mathrm{m}}^{2}/\mathrm{s}$

3. $6.63\times {10}^{-34}$ $\mathrm{kg}-{\mathrm{m}}^{2}$

4. $6.63\times {10}^{-34}J/s$

Subtopic: Einstein's Photoelectric Equation |

58%

From NCERT

AIPMT - 2002

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If particles are moving with the same velocity, then the de-Broglie wavelength is maximum for:

1. proton

2. \(\alpha-\)particle

3. neutron

4. \(\beta-\)particle

Subtopic: De-broglie Wavelength |

62%

From NCERT

AIPMT - 2002

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