7. Electromagnetic radiation is energy that travels in waves. Two types of electromagnetic waves are microwaves and gamma rays. Gamma rays have a
shorter wavelength than microwaves. Which of these statements is true?
A. Gamma rays have a lower frequency than microwaves do.
B. Gamma rays, but not microwaves, can travel through a vacuum.
C. Gamma rays have more energy than microwaves do.
D. Gamma rays travel faster than microwaves in a vacuum.