JEE Main 2024 Physics question
The de-Broglie wavelength of an electron is the same as that of a photon. If velocity of electron is 25% of the velocity of light, then the ratio of K.E. of electron and K.E. of photon will be
Answer: (A)
Solution
The same wavelength means the same momentum: = , and / = 1/4. Then / = (½ / = ½ × ¼ = 1/8.