JEE Main 2015 · 11 Apr · Shift 1 · Physics Q27

PhysicsSingle correct+4 / -1Question 27 of 90

The de - Broglie wavelength associated with the electron in the n = 4 level is :

two times the de-Broglie wavelength of the electron in the ground state

four times the de-Broglie wavelength of the electron in the ground state

half of the de-Broglie wavelength of the electron in the ground state

1/4

^{\text{th}}

of the de-Broglie wavelength of the electron in the ground state

Answer and worked solution

Official answer: B

$2\pi r_n=n\lambda_n$ with $r_n\propto n^2$ , so $\lambda_n\propto n$ . At $n=4$ it is four times the ground-state value.

JEE Main 2015 · 11 Apr · Shift 1, Physics question 27