According to the relation,
λ= where,
λ= wavelength,
h= Planck's constant,
m= mass of the moving particle and
v= velocity of the moving particle.
Given, mass of the particle
(m)= mass of proton
mp ) and velocity of particle
(v)= velocity of light
(c).
Thus, according to the relation
λ== Hence, wavelength (λ) is inversely proportional to the velocity.
∴ Hence, (a) is the correct answer.