JEE · NEET Previous Year Question
An electron of mass and a photon have same energy . The ratio of de-Broglie wavelengths associated with them is [NEET 2016]
Topic: NEET PYQ
Answer: D. Full step-by-step solution below.
- A
- B
- C
- D
Correct answer: D
Solution
(d) Since, it is given that electron has mass . de-Broglie's wavelength for an electron will be given as……..(i)
As kinetic energy of electron
………(ii)
From Eqs. (i) and (ii), we get
……..(iii)
Energy of a photon can be given as
……..(iv)
Now, divide Eq. (iii) by Eq. (iv), we get
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