What is the momentum of a photon in an X-ray beam of 10^{-10} meter wavelength?

1. | \(1.5 \times 10^{-23} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\) |

2. | \(6.6 \times 10^{-24} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\) |

3. | \(6.6 \times 10^{-44} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\) |

4. | \(2.2 \times 10^{-52} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\) |

Subtopic: De-broglie Wavelength |

90%

From NCERT

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Which of the following figures represents the variation of the particle momentum and the associated de-Broglie wavelength?

1. | 2. | ||

3. | 4. |

Subtopic: De-broglie Wavelength |

85%

From NCERT

NEET - 2015

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What is the de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m?

1. $\frac{h}{\sqrt{mkT}}$

2. $\frac{h}{\sqrt{3mkT}}$

3. $\frac{2h}{\sqrt{3mkT}}$ $$

4. $\frac{2h}{\sqrt{mkT}}$

Subtopic: De-broglie Wavelength |

80%

From NCERT

NEET - 2017

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The de-Broglie wavelength of a particle accelerated by a 150 volt potential difference is 10^{-10} m. What will its wavelength be if it is accelerated by a 600 volt potential difference?

1. 0.25 $\stackrel{o}{A}$

2. 0.5 $\stackrel{o}{A}$

3. 1.5 $\stackrel{o}{A}$

4. 2 $\stackrel{o}{A}$

Subtopic: De-broglie Wavelength |

77%

From NCERT

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A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:

1. | Equal to c, the speed of light in vacuum. |

2. | Greater than c. |

3. | Less than c. |

4. | Tending to infinity. |

Subtopic: De-broglie Wavelength |

75%

From NCERT

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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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What will be the percentage change in the de-Broglie wavelength of the particle if the kinetic energy of the particle is increased to 16 times its previous value?

1. 25

2. 75

3. 60

4. 50

Subtopic: De-broglie Wavelength |

69%

From NCERT

NEET - 2014

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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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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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Waves are associated with matter only:

1. | When it is stationary. |

2. | When it is in motion with the velocity of light only. |

3. | When it is in motion with any velocity. |

4. | None of the above. |

Subtopic: De-broglie Wavelength |

57%

From NCERT

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