User:Sathitabalan

Light and sound are the formes of energy. Light is an electro magnatic wave and it can travel through vacume. That’s medium is not essencial to transmition of light. Sound is a mechanical wave for medium is essencial to tranamition of light. Light is essencial to vision. Density of light can be measured in the unit of candela(cd) The object which able to produce own light are called as luminus objects. example:-Sun,Moon,Lighted lamp,Gliwing bulb,Burning paper. The instrument such as drum ,tabla,dolak are the instrunment strech membrum it played by taping The instrument which have a box of thin wood called the sound box. The string fixed with the sound box