Suppose a man who is 6ft tall is standing below a lamppost that is 20ft tall. the man is walking away for the lamppost at a rate of 5ft per second. 1. if the man is moving 5ft per second, make a conjecture as to the rate that his shadow is moving.

2. how far away from the lamppost is the man after 8 seconds?

3. how far is the end of his shadow from the bottom of the lamppost after 8 seconds? use similar triangles to solve this problem.

this means that the temperature of both substances will be equal

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explanation:

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.