Estimate the ratio of the concentration of electrons in the conduction band of carbon (an insulator) and silicon (a semiconductor) at room temperature (293 K). The energy gaps are 5.5 eV for carbon and 1.1 eV for silicon

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)