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A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano . The beat frequency decreases to 2 beats/s when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was : |
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Answer» (256 + 2) Hz `v_(2) = 261` or 251 Hz. when tension in string increases i.e., `V_(2)` increases then beat frequency DECREASES`therefore v_(2)= 251` Hz. So CORRECT choice is (b) . |
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