Задача 60430.

The semiconductor is heated from 20 to 40 ° C and its electrical conductivity increases with a factor of 2.7. Define E - width of the gap of the semiconductor and the wavelength of the red border of the internal photoelectric effect.

Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.