What Is Sound

Sound doesn´t travel through vaccum because...

• is very lazy

• there are no molecules to vibrate

• molecules are very small

• is far away from the Earth

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Any sound with the frequency above 20.000Hz is called...

• ultrasound

• wave

• infrasound

• volume

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The loudness of a sound is known as...

• Volume

• Pitch

• Frequency

• Wave

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The unit of measure for the volume of sound is know as...

• Decibles

• Vibrations

• Communication

• Compression

The human ear is capable of detecting frequencies between...

• 1hz to 2 hz

• 2hz to 20 hz

• 20hz to 20.000hz

• 20.000hz to 100.000hz

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NGSS.MS-PS4-1

Any sound with the frequency below 20Hz is called...

• wave

• vibration

• infrasound

• ultrasound

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Sound is ________________.

• music

• a form of electrical energy

• a form of magnetic energy

• a form of energy made of vibrations

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How are sounds created?

• By our ears

• When an object vibrates

• When an object is heated

• By cooling

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__________ means to move back and forth quickly.

• Pitch

• Amplitude

• Vibration

• Echo

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When you talk your ______ vibrate.

• lips

• ears

• stomach

• vocal cords