A source of sound S is moving with a velocity of 50 m/s toward s a stationary observer ,The observer measurs the frequency of the source as 1000Hz .What will be the apparent frequency of the source when it is moving away from the observer after crossing him ? (take velocity of sound in air is 350m/s)
750 Hz
857Hz
1143Hz
807Hz
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Option 1)
750 Hz
Option 2)857Hz
Option 3)1143Hz
Option 4)807Hz