41 forks are so arranged that each produces 5 beat/sec when sounded with its near fork. If the frequency of last fork is double the frequency of first fork, then the frequencies of the first and last fork respectively
Text Solution
Verified by ExpertsThe correct answer is:
A
Let the frequency of first tuning fork = n and that of last = 2n
n, n + 5, n + 10, n + 15 …… 2n this forms A.P.
Formula of A.P l = a + (N – 1) r where l = Last term, a = First term, N = Number of term, r = Common difference
2n = n + (41 – 1) 5
2n = n + 200
n = 200 and 2n = 400
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