You are walking around a large open field. the only objects nearby are two identical speakers set some distance apart, which are both producing sound, in unison, with a wavelength of 4 m. as you wander around the field, you notice that at certain locations, the sound you hear is surprisingly loud, while at others it seems unusually quiet you conclude that you are observing the effects of interference between the two sources of sound waves. for each of the locations given below, indicate what sort of interference would occur at that point.

the amount of current in the coil

a electromagnetic waves

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.