A man travels 9 units to the right and then 11 units to the left find the displacement and distance travelled

Displacement = -2 units and Distance = 20 units

Explanation:

It is given that,

A man travels 9 units to the right and then 11 units to the left.

We need to find the displacement and distance traveled.

Let the left side is negative and the right side is positive.

Displacement = -11 + 9

= -2 units

Distance = 11 units + 9 units

= 20 units

Hence, the displacement and distance travelled is (-2 units) and 20 units.

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.

well clustered together.

points close on a scatter diagram