Consider two electromagnetic waves A and B traveling in vacuum, where the frequency of A is twice that of B (fA=2fB). Which of the following is/are true?
a. The wavelength of wave A is twice the wavelength of wave B.
b. The wavelength of wave A equals the wavelength of wave B.
c. The speed of wave A is ½ the speed of wave B.
d. The speed of wave A is twice the speed of wave B.
e. The speed of wave A is equal to the speed of wave B.