Can you help me guys?

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.

Failure to accomplish erikson’s psychosocial task of late adulthood leads to despair. a. true b. false

If frequency goes up, what happens to wavelength? does it get shorter or longer?