Waves & Sound · JEE Main previous year questions

2018 1 question

1. Q392018 · 15 Apr 2018 · Shift 1

   A tuning fork vibrates with frequency $256Hz$ and gives one beat per second with the third normal mode of vibration of an open pipe. What is the length of the pipe ? (Speed of sound in air is $340m{s}^{-1}$)

   1. A.$220cm$
   2. B.$190cm$
   3. C.$180cm$
   4. D.$200cm$
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   Answer: D