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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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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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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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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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 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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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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