Asolid plastic ball hits a stationary tennis ball in a perfectly elastic collision. if the mass of the plastic ball is three times that of the tennis ball, which statement is true? the two balls separate but continue to move in the same direction. the two balls stick and move together. the plastic ball stops and the tennis ball starts moving. the plastic ball moves backward.

The two balls separate but continue to move in the same direction

The two balls separate but continue to move in the same direction.

Explanation: due to the mass of the plastic ball the stationary tennis ball gets energy from the collision which make it move away from the plastic ball due to its elastic property

the answer is mosques. they are an important part of islamic culture.

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.