What is critical velocity? Obtain an expression for critical velocity of an orbiting satellite. On what factors does it depend?

What is terminal velocity ?

Obtain an expression for critical speed of a satellite

What is critical angle?

Define critical velocity and derive an expression for the same. OR What is critical velocity? Derive an expression for critical velocity of a satellite orbiting at a certain height. Also discuss the formula when satellite is very close to the earth's surface.

Critical velocity is given by

What is critical photoperiod?

Obtain an expression for the radius of Bohr orbit for H-atom.

What is "critical temperature"?

What is the velocity of a photon ?

On what factors does intensity of sound depends.