Speaker

We use speakers to listen to music. Speakers are used in mobile phones and in televisions too.

Have you ever observed or touched a speaker while it is producing sound?

Does its diaphragm vibrate? 

Let us watch a video of a speaker producing sound.

 

Video 4.1(a) : Normal motion video of vibrating speaker

Video 4.1(b) : Slow motion video of vibrating speaker
 

Sometimes speakers can create a nuisance when someone plays loud music, especially during festivals or marriages.

But how does the sound go forth from a speaker?