Kevin Nash
Last Activity: 11 Years ago
Sol. Let the frequency of the bullet will be f
Given, u = 330 m/s, v base s = 220 m/s
a) Apparent frequency before crossing = f’ = (330/330 - 220) f = 3f
b) Apparent frequency after crossing = f” = (330/530 - 220) f = 0.6f
So, (f”/f’) = 0.6f/3f = 0.2
Therefore, fraction change = 1 – 0.2 = 0.8