When two tuning forks are played at the same time, the beats per second heard are 2 Hz.
What is beat?
It is the number of beats per second equal to the difference between frequencies of two interacting tones.
Given are the two interacting tones f2 = 490 Hz and f1 = 488 Hz.
Then, beat is equal to
B = f2 - f1
B = 490-488
B = 2 Hz
Thus, beats per second heard are 2 Hz.
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