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Question:

What is your observation when two sources are emitting sound with frequency 499 Hz and 501 Hz?

frequency of 500 Hz is heard with change in intensity take place twice

frequency of 2 Hz is heard with change in intensity take place once

frequency of 2 Hz is heard with change in intensity take place twice

frequency of 500 Hz is heard with change in intensity take place once

Solution:

cos(2π499t) + cos(2π501t) = 2cos(2π500t)cos(2πt)
fbeat = 2 Hz
Wave pattern of superposition is shown in the figure.
Frequency of 500 Hz is heard with change in intensity take place twice.