The kinetic molecular theory explains that all matter is composed of particles constantly moving in random directions. what are these "particles"?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

If element x has 99 protons how many electrons does it have

At what time will the interfering waves have an amplitudeof zero?