Which of the following are correct?  Please specify all that apply. In a semiconductor, there are electrons in the conduction band even at absolute zero. The conductivity of a semiconductor can be increased by using photons to excite electrons from the valence band into the conduction band. To do this, the photon energy must be at least as great as the band gap; lower energy photons will not be absorbed. A semiconductor has the same band structure as an insulator, but a smaller gap between the valence and conduction bands. As the temperature of a semiconductor increases, the population in the conduction band increases very rapidly, as does the electrical conductivity. A semiconductor at absolute zero has an empty conduction band above the full valence band.

Pure germanium has a band gap of 0.67 eV.  The Fermi energy is in the middle of the gap.  For a temperature of 270 K, calculate the probability f(E) that a state at the bottom of the conduction band is occupied.

  undergoes alpha decay.  What is the resulting nucleus?

If unplanned change in inventory is zero

Refer to Figure 1. Which of the following will cause a movement from Point D to Point B? 

Refer to Table 1. Society’s MPS is

Essay Question 3 Refer to the information provided in Table 2 below to answer the questions that follow.

Essay question 1(b) Based on the information and your answer in essay question 1(a), what is labor productivity?

Emily wants to make a 6% real return on a loan that she is planning to make, and the expected inflation rate during the period of the loan is 4%. She should charge a nominal interest rate of ______________. 

When an experienced financial analyst quits his/her job at a company and starts looking for a better job in another company, he/she is