What is your observation when two sources are emitting sound with freq

1.	What is your observation when two sources are emitting sound with frequency 499 Hz and 501 Hz ?
Answer» (A) Frequency of 500 Hz is HEARD with change in intensity take PLACE twice. (B) Frequency of 500 Hz is heard with change in intensity take place once. (C) Frequency of 2 Hz is heard with change in intensity take place once. (D) Frequency of 2 Hz is heard with change in intensity take place twice. Solution :Frequency of resultant, WAVE `(f _(1) + f _(2))/(2) =(499 +501)/(2) =500 Hz` (Here intensity of resultant wave changes `f _(2) -f_(1)` times in `1S = (501 - 499 )=2 Hz)`

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