Two tuning forks are producing sounds of wavelength

[merlos]

Two tuning forks are producing sounds of wavelength 36.0 cm and 33.8 cm simultaneously. How many beats do you hear each second?



I know that the # of beats/sec heard is equal to the difference of frequency 2 and 1. Frequency = 1/T = v/lambda.



Don't feel that I have enough information

 

[Doc Al]

Start by figuring out the frequencies of those sounds. Hint: You'll need the speed of sound.

 

[merlos]

Okay, so the speed of sound v=345 m/s
F1 = 345m/s / .36m
=958 Hz

F2 = 345m/s / .338m
=1020.7 Hz

so then beats/second = 1020.7-958??
=63 beats/second

 

[Doc Al]

Sounds about right.