Light waves are electromagnetic waves that travel at 3.00 108 m/s. the eye is most sensitive to light having a wavelength of 5.50 10-7 m. (a) find the frequency of this light wave. hz (b) find its period. s

(a)

Explanation:

The relationship between wavelength, frequency and speed of an electromagnetic wave is:

where v is the speed, f is the frequency, is the wavelength.

For the light wave in the problem, we have:

is the speed of light

is the wavelength

Substituting these numbers into the equation, and re-arranging it, we find the frequency of the light wave:

(b)

Explanation:

The period of a wave is equal to the reciprocal of the frequency:

where f is the frequency of the wave, which we found in the previous part of the exercise. Substituting, we find:

ice to water 1 water to vapour 2 latent heat

the order for strong to weak forces such as

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

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