cse • paper_1 • waves_oscillations
[UPSC CSE 2008] Waves (Q51, 10M)
Find the phase and group velocities for the wave E (z, t) = E_0 \cos (k_1 z - \omega_1 t) + \cos (k_2 z - \omega_2 t) where $ |k_1 - k_2| \ll k_1 k_2 ; |\omega_1 - \omega_2| \ll \omega_1, \omega_2 $.
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