In this sound interferometer, sound waves enter at A and travel to C via paths ABC and ADC. the intensity of the sound can be determined by the microphone placed at C. The length of the path ADC can be changed by a sliding tube.
The frequency is fixed at a certain value and the tube is filled with oxygen gas. Successive minima are detected each time the distance ADC is increased by 0.03m. when the experiment is repeated using hydrogen gas, the corresponding change in ADC is 1.2m.
If the speed of sound in oxygen is 320m/s, would sound move faster or slower in hydrogen?