Hi guys. Was studying waves and got a bit confused. Pl help me out. Coherent sources are those which produce waves of same frequency, wavelength and velocity. Amplitude need not necessarily be same. Am I right? There's another doubt in my mind... If two waves produce beats then which of the following quantities are necessarily same for both of them Angular wave number( and thus wavelength) Angular frequency ( and thus frequecy) Velocity of wave Amplitude Please answer only if 100% sure.