Sound class view

 ಕನ್ನಡದಲ್ಲಿ ನೋಡಿ =Class 8 - World of sounds=
 * 1) Sound as energy
 * 2) How is sound produced
 * 3) Propagation of sound

Hints for problems
=Class 10 - Sound =
 * 1) Echo
 * 2) Doppler Effect
 * 3) Radar
 * 4) Sonar