Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 28

A tube of length L is open at both ends. A stationary wave is set up in this tube when a tuning fork vibrating with frequency fx is held at one end. This is the lowest frequency of stationary wave that can be formed in this tube. Another tube of length 2L is closed at one end. A stationary wave is set up in this tube when a tuning fork vibrating with frequency fy is held at the open end. This is the lowest frequency of stationary wave that can be formed in this tube. Assume the end correction for each tube is negligible. Which equation is correct?

1. Afx = fy/4
2. Bfx = fy/2
3. Cfx = 2fy
4. Dfx = 4fy

As printed in the paper