In order to determine if the two cubes are made of different materials, without conducting other tests, Elaine could . This would determine that cube 1 has and that cube 2 has . These results indicate that cube 1 and 2 are

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.