Wavelength of an electron revolving in 4th orbit is λ. What is the wavelength of the electron in 2nd orbit?
Answer & explanation
Correct answer: option 4
$ 2\pi r = n\lambda$
$ n\lambda = 2\pi r_0 n^2$
$\Rightarrow \lambda \propto n$
$ \Rightarrow \lambda'= \frac{\lambda}{2}$