Just after detonation, the fireball in a nuclear blast is approximately an ideal

Question

Just after detonation, the fireball in a nuclear blast is approximately an ideal blackbody radiator with a surface temperature of about 1.2E7 K. (a) Find the wavelength at which the thermal radiation is maximum and (b) identify the type of electromagnetic wave corresponding to that wavelength. This radiation is almost immediately absorbed by the surrounding air molecules, which produces another ideal blackbody radiator with a surface temperature of about 1.4E5 K. (c) Find the wavelength at which the thermal radiation is maximum and (d) identify the type of electromagnetic wave corresponding to that wavelength.

Explanation / Answer

1. apply LT = 0.0029

so waveelgnth L = 0.0029/(1.2e7)

L = 0.241 nm 0r 2.41 A0

this must be a gamma region

--------------------------------

L = 0.0029/1.4e7

L = 0.207 nm

again gamma region

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