The K.E of neutron of debroglie wavelength 10^11kev
Hello Padala,
You can find wavelength of neutron by using the following formula:-
Wavelength= h/(2*m*E)^1/2
Where,
h= Planck's Constant
E=Kinetic energy
m= mass of neutron
So, on putting all the values in the given formula and on calculating you will get your desired result.
Hope this helps.
Good luck!!