Q 12-11-124JEE MainJEE Main 2021 (18 Mar, Shift 2)Easy
The speed of electrons in a scanning electron microscope is $1\times10^7\ \text{m s}^{-1}$. If the protons having the same speed are used instead of electrons, then the resolving power of scanning proton microscope will be changed by a factor of:
Answer: (A) 1837
Resolving power $\propto \dfrac1\lambda = \dfrac{mv}{h}$. At the same speed it scales with mass: $\dfrac{m_p}{m_e} \approx 1837$.
Solution by Sreeraj P, M.Sc Physics