Question: which of these electromagnetic waves have the longest wavelength quizlet?
Answer: radio waves. has the longest wavelength and shortest frequency. Microwaves. has the 2nd longest wavelength. Infrared radiation. has the 3rd longest wavelength. Visible light. has the 4th longest wavelength. Ultraviolet light. 5th longest wavelength` X rays. has the 6th longest wavelength. Gamma rays.