The number of particles in a gas system inversely affects and directly affects
a. volume; pressure and temperature
b. pressure; temperature and volume
c. temperature; pressure and volume

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.