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## End of chapter exercises

Which of the following is not a longitudinal wave?

1. light

2. sound

3. ultrasound

c.

light

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

1. solid

2. liquid

3. gas

4. vacuum

d.

vacuum

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

1. What is the wavelength of the longitudinal wave?

2. What is the speed of the wave?

1. 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:

1. the period of the note

2. the wavelength of the note

1.
 $P=\frac{1}{f}$

2.

 $\lambda =\frac{v}{f}$ $\lambda =\frac{320}{256}$