Agraduated cylinder contains 20.0 ml of water. after a rock is placed in the cylinder, the level rises as shown below. what is the volume of the rock? rock in cylinder a. 14 cm3 b. 22 cm3 c. 34 cm3 d. 38 cm3

A.

Explanation:

According to the Archimedes' Principle:

A body totally or partially immersed in a fluid at rest, experiences a vertical upward thrust equal to the mass weight of the body volume that is displaced.

In this case the fluid is water. So, the rock, being more dense, will weigh more than water and therefore will displace water that will make the water level in the cylinder to ascend.

Therefore, if we have an initial volume and after the rock was placed the water level rised to (which is the volume displaced by the rock).

We can find the volume of the rock by the following equation:

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.