A 256 Hz tuning fork produces the first harmonic in a tube filled with air and having one closed and one open end. If the tube were filled with helium where the speed of sound is 965 m/sec, what frequency would be needed to produce the first harmonic? Assume the speed of air at the same temperature is 330 m/sec.
The Attempt at a Solution
I have tried:
f=256 Hz, speed of helium=965m/s