# A tuning fork vibrates with frequency 256 Hz 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 of air is 340 ms–1)

Question:

A tuning fork vibrates with frequency $256 \mathrm{~Hz}$ 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 of air is $340 \mathrm{~ms}^{-1}$ )

1. $190 \mathrm{~cm}$

2. $180 \mathrm{~cm}$

3. $220 \mathrm{~cm}$

4. $200 \mathrm{~cm}$

Correct Option: 4

Solution:

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