The band gap for silicon is 1.1eV.(a)Find the ratio of the band gap to kT for silicon at room temperaature 300K.(b)At what tempareture does this ratio become one tenth of the value at 300K?(Silicon will not retain its structure at these high temperatures.)

The energy gap of silicon is 1.14 eV. Find the maximum wavelenth at which silicon starts energy absorption.

Calculate the volume of one mole of any gas at STP and at room temperature (300K) with the same pressure 1 atm.

The energy gap of silicon is 1.5 eV . At what wavelength the silicon will stop to absorb the photon

In an intrinsic semiconductor, the energy gap E_(g) of an intrinsic semiconductor is 1.2 eV. Its hole mobility is very much smaller than electron mobility and is indepndent of temperature. What is the ratio between conductivity at 600K and at 300K? Assume that the temperature dependence of intrinsic concentraction n_(i) is expressed as, n_(i)=n_(o)e^(-E_(g)^(')//k_B)T , where n_(o) is constant and E_(g)^(') is an energy equal to E_(g)//2 , k_(B)=8.62xx10^(-6)eVK^(-1) .

1 liter of an ideal gas (gamma =1.5) at 300k is suddenly compressed to half its original volume. (a) Find the ratio of the final pressure to the initial pressure. (b) If the original pressure is 100 kpa , find the work done by the gas in the process. (c) What is the change in internal energy? (d) What is the final temperature? (e) the gas is now colled to 300k keeping its pressure constant. Calculate the work done during the process . (f) The gas is now expanded iasothermally to achive its original volume of 1 liters. Calculate the work done by the gas .(g) Calculate the total work done in the cycle.

1 liter of an ideal gas (gamma =1.5) at 300k is suddenly compressed to half its original volume. (a) Find the ratio of the final pressure to the initial pressure. (b) If the original pressure is 100 kpa , find the work done by the gas in the process. (c) What is the change in internal energy? (d) What is the final temperature? (e) the gas is now colled to 300k keeping its pressure constant. Calculate the work done during the process . (f) The gas is now expanded iasothermally to achive its original volume of 1 liters. Calculate the work done by the gas .(g) Calculate the total work done in the cycle.