Question

Assertion (A) : The de - Broglie wavelength of a neutron when its kinetic energy is K is λ. Its wavelength is 2λ when its kinetic energy is 4K 

Reason (R) : The de- Broglie wavelength λ is proportional to square root of the kinetic energy.

(a) Both A and R are true and R is the correct explanation of A 

(b) Both A and R are true but R is NOT the correct explanation of A 

(c) A is true but R is false 

(d) A is false and R is also false

Answer 1

Option : (D) 

We have,

λ = \(\frac{h}{\sqrt{2mE}}\) 

i.e., λ ∝ \(\frac{1}{\sqrt E}\) 

Hence,

Assertion is wrong and Reason is also wrong.