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A set of 20 tuning forks is arranged in a series of increasing frequencies. If each fork gives 4 beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of last fork is_____Hz. |
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Answer» f1 = f f2 = f + 4 f3 = f + 2 × 4 f4 = f + 3 × 4 f20 = f + 19 × 4 f + (19 × 4) = 2 × f f = 76 Hz. Frequency of last tuning forks = 2f = 152 Hz |
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