Chapter 11

An increase in temperature will _____ the speed of a sound wave

• increase
• decrease
• stay the same

The pitch of the siren on a rapidly approaching fire truck will

• increase
• decrease
• stay the same

We cannot hear the sounds made by some heavy machinery because the frequencies are in _______ range

• infrasonic
• ultrasonic
• doppler

Scientists and engineers may recommend carpets and draperies for the walls of concert halls to reduce excess

• echolocation
• reverberation
• frequency

Most musical instruments produce sound by having a structure that vibrates linked to a

• voice box
• resonator
• hollow tube

The part of the ear that transfers sound vibrations to the cochlea is the

• hair cells
• ear drum
• oval window

Intensity is measured in

• decibels
• m/s
• amps