Chapter 11: Sound

The ear does the following jobs:

• Collects sounds

• Process sounds

• Sends sound signals to your brain

• All of the given

Pitch is

• high and low

• loud and soft

Sound waves are..........by.....

• refracted/surfaces

• reflected/surfaces

• hit/objects

Sounds are produced by

• vibrating objects

• shaky objects

• Atoms

• air particles

Loudness is how

• loud and soft

• high and low

To measure vibration you need to find

• The wavelength

• The frequency

• The amplitude

Frequency is

• number of vibrations per second

• number of movements made in the process

• distance moved from rest position

If a guitar string vibrates 250 times each second,what is the frequency?

• 500Hz

• 250Hz

• 125Hz

What do we use to measure sound?

• Our ears

• tuning fork

• speed camera

• computer

A ruler vibrates 65 times in 10 seconds.What is the frequency of its vibration?

• 6.5Hz

• 650Hz

• 65Hz