NEET 2026 Physics, question 40.

Consider that an electron is revolving in an excited state of Hydrogen atom with velocity $\sqrt{25.6}\times10^5$ ms$^{-1}$. The radius of the orbit is $x\times10^{-9}$ m. The value of x is :

[Take the mass of electron to be $9\times10^{-31}$ kg, charge of electron = $-1.6\times10^{-19}$ C and $\frac{1}{4\pi\epsilon_0}=9\times10^9$ N m$^2$ C$^{-2}$]