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Q.

A strecthed string is divided into two parts with the help of a wedge. The total length of the string is 1m and the two parts differ by 2mm. When sounded together they produced two beats per second. The frequencies of the notes emitted by the two parts are

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a

none

b

501 & 499 Hz

c

501 & 503 Hz

d

499 & 497 Hz

answer is B.

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Detailed Solution

detailed_solution_thumbnail

l1+l2=1000mm,l1−l2=2mm so, l1=501mm,l2=499mm   
n1501=n1+2499⇒n1=499 Hz and n2=501 Hz

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