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The figure shows different graphs between stopping potential \(V_0\) and frequency (\(\nu\)) for the photosensitive surfaces of cesium, potassium, sodium and lithium. The plots are parallel.

1. | Cesium |

2. | Potassium |

3. | Sodium |

4. | Lithium |

1. | (i) > (ii) > (iii) > (iv) | 2. | (i) > (iii) > (ii) > (iv) |

3. | (iv) > (iii) > (ii) > (i) | 4. | (i) = (iii) > (ii) = (iv) |

Subtopic: Photoelectric Effect: Experiment |

74%

From NCERT

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A \(5\) W emits monochromatic light of wavelength \(5000~\mathring{A}\). When placed \(0.5\) m away, it liberates photoelectrons from a photosensitive metallic surface.
When the source is moved \(1.0\) m away, the number of photoelectrons liberated is reduced by a factor of?

1. \(4\)

2. \(8\)

3. \(16\)

4. \(2\)

Subtopic: Electron Emission |

71%

From NCERT

AIPMT - 2007

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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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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. | \(\sqrt{\dfrac{h\nu}{m}}\) | 2. | \(\sqrt{\dfrac{2h\nu}{m}}\) |

3. | \(2\sqrt{\dfrac{h\nu}{m}}\) | 4. | \(\sqrt{\dfrac{h\nu}{2m}}\) |

Subtopic: Einstein's Photoelectric Equation |

83%

From NCERT

AIPMT - 2013

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When the light of frequency \(2\nu_0\) (where \(\nu_0\) is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is \(v_1\). When the frequency of the incident radiation is increased to \(5\nu_0,\) the maximum velocity of electrons emitted from the same plate is \(v_2.\) What will be the ratio of \(v_1\) to \(v_2\)?

1. | \(1:2\) | 2. | \(1:4\) |

3. | \(4:1\) | 4. | \(2:1\) |

Subtopic: Einstein's Photoelectric Equation |

73%

From NCERT

NEET - 2018

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An electron of mass m with an initial velocity \(\overrightarrow v= v_0\hat i\)$\stackrel{}{}$\( ( v_o > 0 ) \) enters in an electric field \(\overrightarrow E = -E_0 \hat i\)\((E_0 = \text{constant}>0)\) at \(t=0\). If \(\lambda_0\)${\mathrm{}}_{}$

1. \(\frac{\lambda_0}{\left(1+ \frac{eE_0}{mv_0}t\right)}\)

2. \(\lambda_0\left(1+ \frac{eE_0}{mv_0}t\right)\)

3. \(\lambda_0 t\)

4. \(\lambda_0\)

Subtopic: De-broglie Wavelength |

67%

From NCERT

NEET - 2018

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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 \((I_1>I_2)\). 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 \(4000~\mathring{A}\) 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 |

73%

From NCERT

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