When the kinetic energy of particles in a substance decreases, what also decreases?

the size of the particles in the substance.

the number of particles in the substance.

the substance’s specific heat.

the substance’s temperature.

Explanation:

The temperature decreases because kinetic energy means movement of the particle, and movement results in more heat (not specific heat, that's other thing). All this says that, the more movement we have, more heat, which means, higher temperature.

It's the same in the opposite way, the less movement particles have, lower temperature.

So, the correlation is temperature.

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.

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