Modern Physics 4 Question 5
5. If the de-Broglie wavelength of an electron is equal to times, the wavelength of a photon of frequency , then the speed of electron is equal to
(Take, speed of light
Planck’s constant
mass of electron
(Main 2019, 11 Jan I)
(a)
(b)
(c)
(d)
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Solution:
- Wavelength of the given photon is given as,
As, it is given that, de-Broglie wavelength of the electron is
Also, the de-Broglie wavelength of an electron is given as,
Substituting the given values, we get