Answers
The apparent frequency heard by the bat is
The bat reflects this frequency. So it acts like a source for the stationary audience
using
The apparent frequency heard by the bat is f_1 = c + v_b/c f The bat reflects this frequency. So it acts like a source for the stationary audience f_2 = c/c - v_b f_1 = c + v_b/c - v_b f c + v_b/c - v_b = 1.059 2.059 v_b = 0.590c v_b = 59/2059 c almostequalto 9.74 m/s using c = 340 m/s
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