question_answer

The de - Broglie wavelength associated with the electron in the n = 4 level is :[JEE MAIN 11-04-2015]

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

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

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

D) 1/4th of the de-Broglie wavelength of the electron in the ground state 

Correct Answer: B

Solution :

[b] also

for n = 4, the de Broglie wavelength is four times that of ground state.