Class 8 Science | Intensity of Sound

Science and Technology, Class 8, Unit 7

Intensity of Sound

Energy each second · Decibel and W/m² · Five factors

What we will be able to do

🔊

Define the intensity and the loudness of sound

📏

Tell the decibel and W/m² apart and use each correctly

🧮

Find the intensity using \( I = \frac{P}{A} \)

🌬️

Explain the five factors that affect the intensity

How sound reaches the ear

From a vibration to a sound

VIBRATE

A body vibrates and shakes the air around it.

CARRY

The sound wave carries energy away from the source.

HEAR

That energy reaches the eardrum and a sound is heard.

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Presenter notes: Today we work on the energy a sound carries, the two units used to measure it, and the five things that decide how intense a sound is.

Intensity of Sound Presentation

What we will be able to do

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