Sound

is an experiment where only one thing is changed (the independent variable) while everything else is kept the same.

•*Slow vibrations cause a low-pitched sound.

• True

• False

To sing higher notes, the vibrations will become Slower

• True

• False

Bigger vibrations cause a loud sound.

• True

• False

define '' Vibration"

The one thing you change in fair test

• Independent variable
• Dependent variable
• Control variable

A unit used to measure the loudness of sound.

• pascal
• decibel
• hertz
• joule

.................. is used to measure the volume in decibels.

• •A sound level meter:

• Joule
• Decibels (dB)

• Hertz

•Sounds louder than ............. can damage our ears.

• 85 dB

• 60 dB

• 40 dB

• 20 dB

Material that you change

• Independent variable
• Dependent variable
• Control variable