(c)
For a given frequency, intensity of light in the photon picture is
determined by the number of photons crossing an unit area per
unit time (a)
(b)
FIGURE 10 8 (a) Two needles oscillating in
phase in water represent two coherent sources (b) The pattern of displacement of water
molecules at an instant on the surface of water
showing nodal N (no displacement) and
antinodal A (maximum displacement) lines