Thank you..........

Transcript

00:04

Grade 7 science

00:06

11th lesson SOUND

00:09

What is sound?and how it is create?

00:10

SOUND IS A FORM OF ENERGY and IT OS CREATE BY VIBRATING...........

00:15

ACTIVITY.........

00:16

:place your finger on the middle of your throat.then speak something....

00:18

-:VOCAL CORDS are vibrated in our throat to produce SOUND🔊

00:22

Instruments produce sound By vibrating membrance ,vibrating strings,vibrating air column ...

00:28

Vibrating membrance : thabla

00:31

Vibrating string : guitar

00:33

Vibrating air column : flute

00:36

Thank You