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 |

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

(m is the electron mass)

1. $\sqrt{\mathrm{h\nu}/\mathrm{m}}$

2. $\sqrt{2\mathrm{h\nu}/\mathrm{m}}$

3. $2\sqrt{\mathrm{h\nu}/\mathrm{m}}$

4. $\sqrt{\mathrm{h\nu}/\left(2\mathrm{m}\right)}$

Subtopic: Einstein's Photoelectric Equation |

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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 |

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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 |

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The correct graph between the maximum energy of a photoelectron and the inverse of the wavelength of the incident radiation is given by the curve:

1. A

2. B

3. C

4. None of these

Subtopic: Einstein's Photoelectric Equation |

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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 |

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The work function of a metal surface is 2 eV. When the light of frequency f is incident on the surface, the maximum kinetic energy of the photoelectrons emitted is 5 eV. If the frequency of the incident light is increased to 4f, then the maximum kinetic energy of the photoelectron emitted will be:

1. 20 eV

2. 22 eV

3. 26 eV

4. 28 eV

Subtopic: Einstein's Photoelectric Equation |

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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 |

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

1. | 2. | ||

3. | 4. |

Subtopic: Einstein's Photoelectric Equation |

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A metallic surface is exposed to two radiations separately, one of wavelength 4000 Å and the other of 8000 Å. If the work function of metal is 1 eV, then the ratio of maximum kinetic energies of photoelectrons is nearly equal to:

1. $\frac{32}{11}$

2. $\frac{42}{11}$

3. $\frac{52}{11}$

4. $\frac{62}{11}$

Subtopic: Einstein's Photoelectric Equation |

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