Athin film of oil (n = 1.27) is located on smooth, wet pavement. when viewed perpendicular to the pavement, the film reflects most strongly red light at 640 nm and reflects no blue light at 427 nm. how thick is the oil film?

You are given a thin film of oil (n = 1.27) that is located on smooth, wet pavement. Also, it is said that it is viewed perpendicular to the pavement and that the film reflects most strongly red light at 640 nm and reflects no blue light at 427 nm. You are asked to find the thickness of the oil film.

The first thing you need to do is to divide the wavelength of the red light by the index of refraction of the oil to determine the wavelength of the red light in the oil. Then you will use 2t = mλ where t is the thickness, λ is the wavelength and m is the magnification. Note that it is viewed in a perpendicular pavement, m = 1 because it is a constructive interference. 

2t = mλ
2t = (1) (640nm/1.27)
2t = 503.94 nm
t = 251.97 nm

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

The rearrangement of particles in a physical change. hope this