A photon of energy 3.4 eV is incident on a metal having a work function of 2 eV. The maximum K.E. of photo-electrons is equal to:

1. | 1.4 eV | 2. | 1.7 eV |

3. | 5.4 eV | 4. | 6.8 eV |

Subtopic: Einstein's Photoelectric Equation |

91%

From NCERT

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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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When monochromatic photons of wavelength \(4000\) Å are incident on the metal plate of work function \(2.1\) eV, what will be the stopping potential for the photocurrent?

1. | \(1\) V | 2. | \(2.1\) V |

3. | \(3.1\) V | 4. | Zero |

Subtopic: Einstein's Photoelectric Equation |

81%

From NCERT

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The correct graph between the maximum energy of a photoelectron \(\left(K_{max}\right)\) and the inverse of the wavelength \(\left(\frac{1}{\lambda}\right)\) of the incident radiation is given by the curve:

1. | \(A\) | 2. | \(B\) |

3. | \(C\) | 4. | None of these |

Subtopic: Einstein's Photoelectric Equation |

80%

From NCERT

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A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photoelectric current for this light is 3V_{o}. If the same surface is illuminated with light of wavelength 2λ, the stopping potential is V_{o}.
The photoelectric effect's threshold wavelength for this surface is?

1. 6λ

2. 4λ

3. λ/4

4. λ/6

Subtopic: Einstein's Photoelectric Equation |

77%

From NCERT

NEET - 2015

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The work functions for metals A, B, and C are respectively 1.92 eV, 2.0 eV, and 5 eV. According to Einstein's equation, the metals that will emit photoelectrons for a radiation of wavelength 4100 Å is/are:

1. None

2. A only

3. A and B only

4. All the three metals

Subtopic: Einstein's Photoelectric Equation |

78%

From NCERT

AIPMT - 2005

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The variation of the kinetic energy \((K)\) of photoelectrons as a function of the frequency \((f)\) of the incident radiation is best shown by:

1. | 2. | ||

3. | 4. |

Subtopic: Einstein's Photoelectric Equation |

72%

From NCERT

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Light of two different frequencies, whose photons have energies of 1 eV and 2.5 eV respectively, illuminates a metallic surface whose work function is 0.5 eV successively. The ratio of maximum speeds of emitted electrons will be:

1. 1:2

2. 1:1

3. 1:5

4. 1:4

Subtopic: Einstein's Photoelectric Equation |

74%

From NCERT

AIPMT - 2011

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In an experiment of the photoelectric effect, the wavelength of incident radiation is $\lambda $. The wavelength of incident radiation is reduced to $\frac{1}{3}$rd of initial value and the maximum kinetic energy of photoelectron is observed to be n times the previous value.
What will be the threshold wavelength for the metal plate?

1. \(\frac{n-1}{n-3} \lambda \)

2. \(\frac{n}{n-3} \lambda \)

3. \(\frac{n-3}{n-1} \lambda \)

4. \(\frac{n+1}{n-3} \lambda\)

Subtopic: Einstein's Photoelectric Equation |

72%

From NCERT

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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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