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| 1. |
State Kirchoff's law of heat radiation and mention its mathematicalform. |
| Answer» Solution :The RATIO of the emission to the absorptive powers of any body at a GIVEN temperature in a given wavelenght range is a constant and is equal to the emission POWER of a perfectly BLACK body at the same temperature and for the same wavelenght range. The mathematicalfrom of Kirchhoff.s law is `(e_(lambda))/(a_(lambda)) = E_(lambda)` | |