On this physical science question will vote ! why is a sound wave considered to be a mechanical wave? what properties of sound waves are responsible for pitch and volume

Which type of microscope would allow the viewer to see ribosomes inside a cell?

More solar radiation is absorbed by earth’s surface than by

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.