State any four applications of a communication satellite

State any four applications of LED

State any four applications of photodiode?

State applications of polaroids .

State applications of acoustics?

State medical applications of acoustics?

State main applications of transformer.

What is a geostationary satellite? State its two uses. OR What is a communication satellite? Give any two of its uses.

State some applications of convection.

In satellite communication, the communication satellite.