Question

1.
The length of the closed pipe whose frequency equal to that of open pipe of 60cm length.
1) 30cm
2) 60cm
3) 90cm
4) 120cm​

Answer 1

Answer:

1) 30 cm

Explanation:

This is because due to the pipe being closed at one end, the sound waves bounce back towards the entrance. Therefore the sound waves will travel twice the length. If 60 cm travel distance is needed for the frequency, then it should totally travel 60 cm. Which means It travels 30 * 2 cm. This is why 30 cm is the answer.