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The formulae for Planck length, Hawking temperature and Unruh-Daviestemperature are derived by using only laws of classical physics together withthe Heisenberg principle. Besides, it is shown how the Hawking relation can bededuced from the Unruh relation by means of the principle of equivalence; thedeep link between Hawking effect and Unruh effect is in this way clarified.Comment: LaTex file, 6 pages, no figure

Some heuristic semi-classical derivations of the Planck length, the Hawking effect and the Unruh effect