Three children are lined up to a 50-meter race. the children all weigh the same. they start running at the same speed but child 1 runs fastest over the final 10 meters and crosses the finish line first. what is true about the kinetic energy of child 1 at the moment she crosses the finish line? A. it is less than that of the other two children

B. it is the same as the other two children

C. it is greater than that of the othere two children

D. child 1 has no kinetic energy at the moment she crosses the finish line​

the one with the highest speed

powerful computers now, not then

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.