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Read the following paragraph and answer the following questions : In a reaonance tube apparatus a tunning fork of unknown frequency after striking with a rubber pad is held near the open end of resonance tube. The airm column of resonance tube can be varied. For definite length of air column is resonance tube. the airm column of resonance tube can be varied. For definite length of air column in resonance tube, standing waves are set up due to superposition of sound arives travelling in oppositc directions. the smallest value of length of air column which intensity of sound is maximum is 10 cm. Take speed of sound 344 m/s. Find the number of times, intensity is maximum in time interval of 1 sec. |
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Answer» 4 `y = A cos (0.46 pi x - 92 pi t)` comparing these equations with standard FORM y = A cos `[ kx - 2pi VT]` we have ` 2pi v_(2) = 100 pi RARR v_(1) = 50 ` ` 2pi v_(2) = 92 pi rArr v_(1) = 46 ` `therefore` beat frequency b = `v_(1) - v_(2) `50 - 46 = 4Hz. |
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