39. What makes mechanical waves different from
electromagnetic waves?
A. Mechanical waves consist of disturbances that can
only travel through a medium, while electromagnetic
waves can travel even without a medium.
B Electromagnetic waves need a medium to travel,
while mechanical waves can travel without medium.
C. Mechanical waves can be created by wiggling a rope
up and down, while a sound wave can be created by
wiggling a rope back and forth.
D. The amplitude of electromagnetic waves tells about
its energy, while in mechanical waves amplitude is its
frequency
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D. The amplitude of electromagnetic waves tells about
its energy, while in mechanical waves amplitude is its
frequency.