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A dog chases a mailman with a speed of 6 m/s. If the dog barks with a frequency of 415 Hz, what frequency does the mailman here as he is running away from the dog with a speed of 12 m/s?
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Answer #1

Apparent frequency

f' = f_0 * rac{v-v_0}{v-v_s}

-415 4-10 343 - 6

= 407.6 Hz

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