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An \(\alpha\text-\)particle moves in a circular path of radius \(0.83~\text{cm}\) in the presence of a magnetic field of \(0.25~\text{Wb/m}^2\). The de-Broglie wavelength associated with the particle will be:

1. \(1~\mathring{\text{A}}\)

2. \(0.1~\mathring{\text{A}}\)

3. \(10~\mathring{\text{A}}\)

4. \(0.01~\mathring{\text{A}}\)

Subtopic: De-broglie Wavelength |

58%

From NCERT

AIPMT - 2012

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A radioactive nucleus of mass M emits a photon of frequency $\nu $ and the nucleus will recoil. The recoil energy will be:

1. $\frac{{\mathrm{h}}^{2}{\mathrm{\nu}}^{2}}{2{\mathrm{Mc}}^{2}}$

2. zero

3. $\frac{\mathrm{h\nu}}{\mathrm{c}\sqrt{2\mathrm{M}}}$

4. $\frac{\mathrm{c}\sqrt{2\mathrm{M}}}{\mathrm{h\nu}}$

Subtopic: De-broglie Wavelength |

64%

From NCERT

AIPMT - 2011

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In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:

1. 1.3 V

2. 0.5 V

3. 2.3 V

4. 1.8 V

Subtopic: Photoelectric Effect: Experiment |

74%

From NCERT

AIPMT - 2011

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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. \(1:4\)

1. \(1:2\)

2. \(1:1\)

3. \(1:5\)

4. \(1:4\)

Subtopic: Einstein's Photoelectric Equation |

75%

From NCERT

AIPMT - 2011

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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV, then the de-Broglie wavelength associated with the electrons would:

1. decrease by 2 times

2. decrease by 4 times

3. increase by 4 times

4. increase by 2 times

Subtopic: De-broglie Wavelength |

74%

From NCERT

AIPMT - 2011

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A source S_{1} is producing 10^{15} photons per sec of wavelength 5000 Å. Another source S_{2} is producing 1.02×10^{15} photons per second of wavelength 5100 Å. Then, (power of S_{2})/(power of S_{1}) is equal to:

1. 1.00

2. 1.02

3. 1.04

4. 0.98

Subtopic: Photoelectric Effect: Experiment |

75%

From NCERT

AIPMT - 2010

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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be:

1. 2.4 V

2. -1.2 V

3. -2.4 V

4. 1.2 V

Subtopic: Einstein's Photoelectric Equation |

61%

From NCERT

AIPMT - 2010

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Monochromatic light of wavelength 667 nm is produced by a helium-neon laser. The power emitted is 9mW. The number of photons arriving per second on average at a target irradiated by this beam is:

1. 9 x 10^{17}

2. 3 X 10

3. 9 x 10

4. 3 X 10

Subtopic: Photoelectric Effect: Experiment |

78%

From NCERT

AIPMT - 2009

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The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations. Which one of the following is a correct statement?

** **

1. | Curves \(a\) and \(b\) represent incident radiations of different frequencies and different intensities. |

2. | Curves \(a\) and \(b\) represent incident radiation of the same frequency but of different intensities. |

3. | Curves \(b\) and \(c\) represent incident radiation of different frequencies and different intensities. |

4. | Curves \(b\) and \(c\) represent incident radiations of the same frequency having the same intensity. |

Subtopic: Photoelectric Effect: Experiment |

85%

From NCERT

AIPMT - 2009

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The number of photoelectrons emitted for the light of a frequency $\nu $ (higher than the threshold frequency $\nu $_{0}) is proportional to:

1. $\nu $ -$\nu $_{0}

2. threshold frequency ($\nu $_{0})

3. intensity of light

4. frequency of light ($\nu $)

Subtopic: Photoelectric Effect: Experiment |

78%

From NCERT

AIPMT - 2009

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