Class 8 Science | Sound

Science and Technology, Class 8

Sound

Made by vibration · Four wave quantities · Speed v = f × λ

What this lesson gives you

🔔

Name the sources of sound around you

〰️

Explain how vibration makes a wave

📏

Measure frequency, time period, wavelength and amplitude

🧮

Use the speed formula in calculations

Activity

What a tuning fork shows

STRIKE

Strike the tuning fork gently on a rubber pad.

LISTEN

Hold it near the ear and listen to the steady note.

TOUCH

Touch the prongs and feel them trembling.

STOP

Grip the prongs and the note stops with the trembling.

The notes are free to read in full.

Presenter notes: Ask the class to shut their eyes for a moment and count the sounds they can hear. Then ask where each of those sounds came from.