Two particels (A) and (B) are in motion . If the wavelngth wavelength associated with particel (B) if its momentum is half of (A).

Explanation

` lambda _A = h/(P_A) and lambda _B = h/(p_B)`
` ( lambda _A)/( lambda _B) = P_B/P_A ("Given " P_B = 1/ 2 P_A)`
` ( 5 xx 10^(-8))/( lambda _B) = 1/2`
` :. lambda _B = 1 xx 10^(-7) m`.