In particular, the energy of a photon equals Planck's constant times the frequency of the radiation. Mathematically, this is given by the equation E = hf. Planck's constant is the fundamental constant of quantum theory that determines the scale of the small-scale world.lanck's constant = 6.63 * 10^-34 joule-second (J-s). The total energy in an electromagnetic wave is the sum of the energies of each photon in the wave. The energy of a photon is so small that we usually measure it in electronvolts (eV). One eV is the potential energy of each electron in a 1-volt battery.
A social revolution inevitably encounters an obstacle in the form of the political power of the ruling class. Hence, the first act of a social revolution is political revolution, the attainment of state power by the revolutionary class.
Before the revolution, French society was divided into three estates or orders. The First Estate contained around 130,000 ordained members of the Catholic church: from archbishops and bishops down to parish priests, monks, friars and nuns. The First Estate occupied a prestigious place in the social order. Belief in God, religion and the afterlife dominated late 18th century Europe, so for ordinary people the church and its clergy were the only avenues for understanding or accessing God and the afterlife.