The universe is filled with photons left over from the big bang that today have an average energy of about 2 × 10−4 ev (corresponding to a temperature of 2.7 k). as derived in lecture, the number of available energy states per unit volume for photons is

The number of available energy states per unit volume is

Explanation:

Given that,

Average energy  

Photon =

We need to calculate the number of available energy states per unit volume

Using formula of energy

Where, E = energy

h = Planck constant

c = speed of light

Put the value into the formula

Hence, The number of available energy states per unit volume is

Africans having pride in their own culture despite being ruled by people of different cultures gave them a sense of self worth.

Explanation:

The people of Africa were ruled by people of different cultures and by the people from different countries. They had a history of colonial rule where they were a colony of many countries.

But despite being ruled by people of different cultures, the people of Africa had pride in their own culture. This gave these people a sense of self worth. The Africans had pride in their own culture, in their own language and their own nation.