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solve the below question
Asked by sarveshvibrantacademy | 21 Mar, 2019, 10:58: AM
Expert Answer
when detector is moving towards source , frquency n detected by detector is given by
n = no [ 1 + ( vo / v ) ] ...............................(1)
where no is the frequency of sound emitted by source, vo is speed of detector and v is speed of sound.
since the detector is freely falling, its velocity is vo = g×t at every t seconds starting from t=0.
by substituting for vo in eqn.(1), we get n = n0 + (no g / v ) t .................(2)
In the eqn.(2) that relates the frequency and time linearly, we get the slope (no g / v ).
From the given graph we have slope 1000/30 or 100/3
hence (no g / v ) = 100/3 or v = (3/100)×1000×10 = 300 m/s
Answered by Thiyagarajan K | 21 Mar, 2019, 12:32: PM
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