CH 17 8th Grade Science Sound Putman

To produce sound, an object must be ____.

• moving toward the listener
• vibrating
• heated
• in a gas

You produce speech by vibration of the ____.

• throat bones
• skin
• lips
• vocal cords

____ is the human perception of the energy a wave carries.

• loudness
• speech
• wave
• frequency

Hearing damage begins to occur at sound levels of about ____ decibels.

• 25
• 65
• 85
• 125

____ is made of sounds that are irregular and disorganized.

• doppler effcet
• loudness
• noise
• music

Sound travels fastest in a ____.

• gas 
• liquid
• solid
• vacuum

When you speak, your words are transferred to a friend ____.

• by molecules colliding
• by electromagnetic waves
• in between air molecules
• by transverse waves

You can hear sound around an open door because sound waves ____.

• reflect
• refract reflect
• diffuse
• diffract

The number and intensity of ____ produced by each instrument are different and give instruments their distinctive sound quality.

• overtones
• beats
• vibrations
• pitches

Resonance can be used to ____ sound.

• Amplify
• increase
• decrease
• modulate