What is a photovoltaic cell? Plz answer it fast................

WAT O WE MEAN BY AERODYNAMICS ???

 what is biomass?

 full form of MW?

Mam i have a question related to physics, the question is like this

if a body is moving with uniform speed in a particular direction on a perfectly smooth surface, then no force is acting on it. True or false,Explain

In an explosion, a piece of debris is tossed 99 meters NorthWest. What is the displacement in the north and west directions? please show steps.

 A concave reflector increases the temperature that can be obtained inside a solar cooker. Give reason.

can you explain solar pond?

 Why are vehicles fitted with a catalytic converter?

Explain this

 HOW DOES LARGE DAMS RELEASE METHANE GAS?

sir , it will be very kind of you if you could explain the way electicity is formed in nuclear powerplants? and why it is adviced to wear lead clothes while working in a nuclear power plants sir?

A body is released from a certain height above the surface of the earth. what happens to its potential energy?

What are the main advantages of nuclear energy?

Which one of the following can be seen in a dark room? why?

1. mirror  2. white paper  3. tungsten  4. hot steam iron