When sound travels through air, the particles a. vibrate along the direction the wave travels b. vibrate but not in any fixed direction c. vibrate perpendicular to the direction wave d. do not vibrate 3

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.