How an electron microscope magnifies an image?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

During convection, less dense fluid rises and denser fluid sinks.