Question

A source of sound S emitting waves of frequency
100 Hz and an observer O are located at some
distance from each other. The source is moving with a speed of 19.4 m/s at an angle of 60° with
the source observer line as shown in the figure. The
observer is at rest. The apparent frequency observed
by the observer (velocity of sound in air 330 m/s),
is​

Answer 1

The answer is 103 Hz .

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Answer 2

I hope it's helpful for you