Radiant energy

Yet the flash of the explosion was so bright that it continued to cast secondary shadows at a distance of 124 miles from the epicentre! From these measurements they worked out that the radiant energy of the explosion must have been around 2-8 x 10 <23> ergs. (Let me explain: the erg in science is the so-called 'measurement of work'. A beetle with a mass of 1 gramme performs 981 ergs' worth of work when it climbs a wall 1 cm high.) The expedition found branches and twigs on the tops of trees that had been carbonised, up to range of eleven miles. From this they concluded that sudden heating had taken place. This was the result of an explosion, not a forest fire! These carbonisations were only found where there had been no shadows to interrupt the diffusion of the flash. Clearly and unquestionably it must have been a case of radiation. The sum of all these effects makes the energy of 10 <23> ergs necessary for the gigantic devastation. This immense energy corresponds to the destructive power of an atom bomb weighing 10 megatons or 100,000,000,000,000,000,000,000, ergs! All the investigations confirmed a nuclear explosion and related to the realm of fable explanations such as the impact of a comet or the fall of a great meteorite ...»