Dual Nature of Radiation and Matter - Result Question 16

17. Which of the following moving particles (moving with same velocity) has largest wavelength of matter waves?

[2002]

(a) Electron

(b) $\alpha$-particle

(c) Proton

(d) Neutron

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Answer:

Correct Answer: 17. (a)

Solution:

  1. (a) de-Broglie wavelength $\lambda=\frac{h}{m v}$

For same velocity, $\lambda \propto \frac{1}{m}$

Out of given particles, the mass of electron is minimum, so the associated de-Broglie wavelength is maximum for electron.