Which demonstrates simple harmonic motion? a player dribbling a basketball a chandelier swinging from the ceiling a lion pacing the length of a cage a spring compressed in a ballpoint pen

The answer is B, since simple harmonic motion means restores the objects equilibruim, the chandelier is the only object that is swinging and restored back to it's equilibruim.

Answer : The correct option is (b).

Explanation :

The type of motion in which the restoring force is directly proportional to the displacement of a particle form the equilibrium position. This force acts in opposite direction.

x is the displacement

The example that shows the simple harmonic motion is (b) " a chandelier swinging from the ceiling ". This is because a chandelier moves to and fro from its equilibrium position and restores it.

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.