Question

beat is used to determine -
i. velocity of sound
ii. the unknown frequency
iii. tune of musical instruments​

Answer 1

Answer:

beat is used to tune of musical instruments

Explanation:

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Answer 2

Answer:

A beat is a pulse of time. A ticking clock is a good example. Every minute, the second hand ticks 60 times, and each one of those ticks is a beat. If you speed up or slow down the second hand, you're changing the tempo of the beat.