Decibels

Sound levels, or volume, are measured in special units called ______________.

• centimeters (cm)

• degree Celcius (°C)

• decibels (dB)

• noise (Ns)

What is the sound level of a jet on take-off?

• 135dB

• 140dB

• 150dB

• 120dB

What sounds might have given the reading of 125.1 dB.

• whispering

• rain falling

• loud firework

• busy city traffic

What sounds might have given the reading of 53.8 dB.

• someone talking quietly

• rain falling

• loud firework

• busy city traffic

Most health authorities suggest ear protection for sounds above 85 decibels. Do you think you should wear ear protection when using a lawnmower?

• Yes

• No

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

We use a (a)   level meter to measure the volume of sounds in decibels

Tags

NGSS.MS-PS4-1

Explain how you think a sound level meter works.

• The microphone records the light and the meter measures it brightness. The sound level is displayed digitally on a small screen

• The microphone records the sound and the meter measures it volume. The sound level is displayed digitally on a small screen

• The microphone records the loud sound only and the meter measures it volume. The sound level is displayed digitally on a small screen

• The microphone records the low sound only and the meter measures it volume. The sound level is displayed digitally on a small screen

Sound levels, or volume, are measured in special units called ______________.

• centimeters (cm)

• degree Celcius (°C)

• decibels (dB)

• noise (Ns)

We use a ________ level meter to measure the volume of sounds in decibels.

• sound

• light

• temperature

• pressure

Tags

NGSS.MS-PS4-1

Explain how you think a sound level meter works.

• The microphone records the light and the meter measures its brightness. The sound level is displayed digitally on a small screen.

• The microphone records the sound and the meter measures its volume. The sound level is displayed digitally on a small screen.

• The microphone records the loud sound only and the meter measures its volume. The sound level is displayed digitally on a small screen.

• The microphone records the low sound only and the meter measures its volume. The sound level is displayed digitally on a small screen.