Which two statements correctly describe the role of a semiconductor in a solar cell?
A. The electrons freed from the semiconductors by light exit the cell
and never return.
B. When the semiconductors become charged, current flows from
the negative one to the positive one.
C. When photons are absorbed, electrons from the semiconductor
are freed because of the photoelectric effect.
D. When the semiconductors become charged, current flows from
the positive one to the negative one.

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.