If the energy density and velocity of a wave are u and c respectively then the energy propagating per second per unit area will be -

Energy propagation in string wave

Kinetic energy per unit volume of a gas is

Two black bodies A and B emit radiations with peak intensities at wavelengths 4000 A and 8000 A respectively. Compare the total energy emitted per unit area per second by the two bodies.

The energy stored per unit volume of a strained wire is

Strain energy per unit volume is given by

I : Electromagnetic wave is a mechanical wave. II : The energy crossing per unit area per unit time and perpendicular to the direction of propagation of electromagnetic wave is called intensity. Which one is correct?

strain energy per unit volume is