What bias conditions must be present for the normal operation of a transistor amplifier?
a. the emitter-base junction must be forward biased, and the collector-base junction must be reverse biased.
b. both junctions must be forward biased.
c. the emitter-base junction must be reverse biased, and the collector-base junction must be forward biased.
d. both junctions must be reverse biased.

The condition that must be present for the normal operation of a transistor amplifier is the emitter-base junction must be reverse biased, and the collector-base junction must be forward biased. The answer is letter C. It should not drive the transistor either into saturation or into cu – off, resulting in one will deem transistors to be inefficient

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.