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.
Jane Addams (September 6, 1860 â May 21, 1935) was a pioneer American settlement activist/reformer, social worker, public philosopher, sociologist, author, and leader in women's suffrage and world peace. She created the first settlement house in the United States, Chicago's Hull House. In an era when presidents such as Theodore Roosevelt and Woodrow Wilson identified themselves as reformers and social activists, Addams was one of the most prominent reformers of the Progressive Era.