(a) Explain the terms energy density and intensity of wave.
(b) Show that the intensity of a wave is proportional to the square of the amplitude.

The dimensions of intensity of wave are

What is meant by the intensity of a wave ?

In simplest terms, the energy of a wave is directly proportional to the square of Its

The intensity ratio of two waves is 1 : 16 . The ratio of their amplitudes is

The ratio of the intensities two waves is 1 : 9 The ratio of their amplitudes is

For energy density, power and intensity of any wave choose the correct options.

Statement-1 : Two longitudinal waves given by equation y_(1)(x,t)=2asin(omegat-kx) and y_(2)(x,t)=a sin (2 omegat-2kx) will have equal intensity. Statement-2 : Intensity of waves of given frequency in same medium is proportional to square of amplitude only.

Statement-1 : Two longitudinal waves given by equation y_(1)(x,t)=2asin(omegat-kx) and y_(2)(x,t)=a sin (2 omegat-2kx) will have equal intensity. Statement-2 : Intensity of waves of given frequency in same medium is proportional to square of amplitude only.

The intensity of a wave is (a) Proportional to square of the frequency (b) Proportional to the velocity of wave (c) Proportional to the density of the medium (d) Proportional to the square of the distance of the source from the observer

Explain the following giving reasons : (i) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. (ii) When ligjt travels from a rarer to a denser medium, the speed decreases. Does this decrease in speed imply a reduction in the energy carried by the wave ? (iii) In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity in the photon picture of light ?