Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)
A)The higher-frequency travel faster than the lower-frequency waves.
B)The higher-frequency waves have shorter wavelengths than the lower-frequency waves.
C)The wavelengths of the visible waves are some of the longest electromagnetic waves.
D)The wavelengths of the visible waves are some of the shortest electromagnetic waves.
E)The $\vec { E }$ field vector is always at right angles to the $\vec { B }$ field vector.

Question

Quizplus · Accepted Answer

B) This is true because the speed of light in a vacuum is constant, and the speed of a wave is equal to its frequency multiplied by its wavelength. Since the speed is constant, as frequency increases, wavelength must decrease to maintain a constant speed.
E) This is always true for electromagnetic waves in a vacuum, as these fields are perpendicular and mutually perpendicular to the direction of propagation of the wave.

Which of the Following Statements About Electromagnetic Waves in a Vacuum