Awoman with mass m is standing on a platform and holding onto a light rope attached to a hook in the ceiling. a second rope, also attached to the hook, is being held by a man with larger mass m on a second platform. the ropes are the same length, and the ropes are initially horizontal. the two people start from rest and swing toward each other. they meet at the lowest point of their swings, and grab onto one another, swinging upward until the ropes make an angle of 36.8° with the vertical. find the value of the ratio m/m .

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.

i think the answer is a, hope this : )