3. A sample of an unknown elemental semiconductor had the following values of resistance at the given temperatures: T (K) 310 339 360 383 405 434 R (2) 13.5 4.95 2.41 1.22 0.74 0.37 Calculate its band (energy) gap and, comparing this value with published data, what is the likely semiconductor? Do you think your calculated value is reasonable? Why/why not? Hint: Remember the relationships between resistance, resistivity and conductivity, then use the relevant conductivity equation for plotting In(1/R) vs 1000/T