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The curves (1), (2), (3) and (4) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light ( ${\mathrm{I}}_{1}>{\mathrm{I}}_{2}$). In which figure is the correct variation shown?

1. | 2. | ||

3. | 4. |

Subtopic: Photoelectric Effect: Experiment |

92%

From NCERT

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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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When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and saturation current are 0.6 volts and 18 mA respectively. What will happen if the same source is placed 0.6 m away from the photoelectric cell?

1. | the stopping potential will be 0.2 volts. |

2. | the stopping potential will be 0.6 volts. |

3. | the saturation current will be 6 mA. |

4. | the saturation current will be 18 mA. |

Subtopic: Einstein's Photoelectric Equation |

71%

From NCERT

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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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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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If alpha, beta and gamma rays carry the same momentum, which has the longest wavelength?

1. | Alpha rays | 2. | Beta rays |

3. | Gamma rays | 4. | None, all have same wavelength |

Subtopic: De-broglie Wavelength |

66%

From NCERT

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A 200 W sodium street lamp emits yellow light of wavelength 0.6 $\mathrm{\mu m}$. If it is 25% efficient in converting electrical energy to light, how many photons of yellow light does it emit per second?

1. $1.5\times {10}^{20}$

2. $6\times {10}^{18}$

3. $62\times {10}^{20}$

4. $3\times {10}^{19}$

Subtopic: Particle Nature of Light |

70%

From NCERT

AIPMT - 2012

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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage were 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 |

78%

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 the ratio of the power of S_{2} to the power of S_{1 }is equal to:

1. | 1.00 | 2. | 1.02 |

3. | 1.04 | 4. | 0.98 |

Subtopic: Particle Nature of Light |

73%

From NCERT

AIPMT - 2010

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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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