Two particle A and B of de-Broglie wavelength λ1 and λ2 combine to form a particle C. The process conserves momentum. Find the de-Broglie wavelength of the particle C.

Q: Two particle A and B of de-Broglie wavelength λ1 and λ2 combine to form a particle C. The process conserves momentum. Find the de-Broglie wavelength of the particle C. (The motion is one-dimensional)