1. An electromagnetic wave travels from a vacuum into a
transparent material with an index of refraction n > 1. Which of
the following correctly describes the electromagnetic wave in the
transparent material compared to the vacuum?
A. Its speed and frequency decrease, while its wavelength
remains constant.
B. Its frequency and wavelength decrease, while its speed
remains constant.
C. Its speed, wavelength, and frequency all decrease.
D. Its wavelength decreases, but its speed and frequency remain
constant.
E. Its speed and wavelength decrease, while its frequency
remains constant.
