Question

Find the speed of sound in a gas in which two waves of wavelength 50cm and 50.4cm produce 6 beats per second is​

Answer 1

Answer:

Explanation:

You need to use the wave equation:

f=vλ

In your problem, your have two different wavelengths, and hence two different frequencies. So you set up the wave equation for each:

f1=vλ1

and

f2=vλ2

You know λa and λ2. You need to find v. However, you have the beat frequency, which is exactly equal to the difference of the two frequencies, i.e.

f2−f1=12 Hz

Solve, and you should get v=306 m/s.