In a test of a new missile defense system, a missile is fired on a trajectory that would directly
strike the center of a certain bunker, which is 20 m long. A laser flash from the bunker
ignites the missile’s fuel, causing it to explode into two fragments, one with 1.8 times the
mass of the other. If the fragments land at the same time 52.7 m apart, by how much does
the larger fragment miss hitting the bunker? Ignore the effects of air resistance. (Hint: Think
about the trajectory of the missile if it had not exploded into two fragments. Is the explosion
an internal interaction or an external interaction? How does each kind of interaction affect
the motion of the center of mass of a system?)

answer:

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the force on the thing and the distance the force moves the thing

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.