3. . . . . . . . Consider several points on the wave front to be sources of secondary wavelets. . . . . . . .
8. AM band radio waves travel farther than FM band radio waves because (a) AM waves travel faster than FM waves (b) AM wavelengths are shorter than FM wavelengths (c) AM waves are scattered more than FM waves (d) AM waves are diffracted more than FM waves (d) AM waves are diffracted more than FM waves