Question

If kinetic energy of a proton is increased nine times the wavelength of the debroglie wave associated with it would become

Answer 1

We know that debroglie wave length is given as
Lemda = h/√2KM

Here lemda is wavelength
h is Planck's constant
k is kinetic energy
M is mass of photon.

Acc. to ques.
K = 9K

Lemda' =1/3 Lemda

Hope you get your answer.