End of chapter exercises
Which of the following is not a longitudinal wave?

light

sound

ultrasound
Which of the following media can a longitudinal wave like sound not travel through?

solid

liquid

gas

vacuum
A longitudinal wave has a compression to compression distance of 10 m. It takes the wave 5 s to pass a point.

What is the wavelength of the longitudinal wave?

What is the speed of the wave?
 10 m
b) $v=f\lambda $
$f=\frac{1}{T}=\frac{1}{5}=0,2$
$v=\left(0.2\right)\left(10\right)=2\text{m}\cdot {\text{s}}^{1}$
A flute produces a musical sound travelling at a speed of 320 m·s^{−1}. The frequency of the note is 256 Hz. Calculate:

the period of the note

the wavelength of the note
1.
$P=\frac{1}{f}$ 
$P=\frac{1}{256}=0,004\text{s}$ 
2.
$\lambda =\frac{v}{f}$ 
$\lambda =\frac{320}{256}$ 
$=1,25\text{m}$ 