Physics (AS & A Level) · May / June 2018 · Paper 13 · Question 24

A vibrating tuning fork is held over a measuring cylinder, as shown. Water is then gradually poured into the measuring cylinder. A much louder sound is first heard when the water level is 2.9 cm above the base of the measuring cylinder. A second much louder sound is heard when the water level reaches a height of 67.3 cm above the base. The speed of sound in air is 330 m s⁻¹. What is the frequency of the tuning fork?

1. A128 Hz
2. B256 Hz
3. C512 Hz
4. D1024 Hz

As printed in the paper