Question

A dog can hear sounds in the range from 15
to 50,000 Hz.
What wavelength corresponds to the lower
cut-off point of the sounds at 20◦C where the
sound speed is 344 m/s?
Answer in units of m.

Answer 1

The frequency corresponding to the lower cut-off point is 

$$f=15\ Hz$$

$$\lambda=\frac{v}{f}$$

$$\lambda=\frac{344}{15}=22.9\ m$$