Compression or sound waves behave a lot like transverse or electromagnetic waves. compression waves exhibit all but one of the following behaviors. that is a) reflection. b) refraction. c) transfer energy. d) travel through a vacuum.

(D. travel through a vacuum.) All waves need a medium to wave. In a vacuum there is no medium to wave.

The correct choice would be

D) travel through a vacuum.

Electromagnetic waves are transverse in nature and do not require a medium to travel from one point to another. On the other hand, sound waves are longitudinal waves and require a medium to travel from one point to another. hence sound waves can not travel through vacuum but electromagnetic waves can.

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.