A particle ‘P’ is formed due to a completely inelastic collision of particles ‘x’ and ‘y’ having deBroglie wavelengths ‘ ’ and ‘ ’ respectively. If x and y were moving in opposite directions , then the deBroglie wavelength of ‘P’ is 

(a) 
(b) 

(c) 
(d) 

A particle ‘P’ is formed due to a completely inelastic collision of particles ‘x’ and ‘y’ having deBroglie wavelengths ‘ ’ and ‘ ’ respectively. If x and y were moving in opposite directions , then the deBroglie wavelength of ‘P’ is 

(a) 
(b) 

(c) 
(d) 
