Sound and Intensity

The measured intensity of sound depends on both the distance from the source and the _____ of the sound source.

• frequency

• power

• pitch

• wavelength

An amplifier puts out a maximum of 150 W of power. What is the intensity of the maximum output of power at a distance of 5.0 m from a speaker?

An amplifier puts out a maximum of 150 W of power. What is the intensity of the maximum output of power at a distance of 15.0 m from a speaker?

A set of earbuds is emitting a sound with an intensity of 2.3 x 10^-6 W/m² at a distance of 0.35 cm from a person's eardrum. What is the amount of power that the earbuds are emitting?

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

A person experiences a sound intensity of 1.5 x 10^-3 W/m² from a lawn mower and the mower has an output of 2.1 W of sound power. How far away from the mower is person?

Tags

NGSS.HS-PS4-1

A pair of hearing protecting headphones have a decibel reducing rating of 25 dB. By what factor are the headphones reducing a sound's intensity? Choose the best answer.

• 2.5

• 100

• 200

• 250

• 300

An amplifier increases a sounds intensity from 1.0 x 10^-9 W/m² to 1.0 x 10^-3 W/m². What would be the closest increase in decibel level of the sound?

• 30

• 60

• 1,000

• 1,000,000

Tags

NGSS.HS-PS4-5