Answer: B. Title 1 is “Transverse Waves,” and Title 2 is “Longitudinal Waves.”
Explanation:
In transverse waves, the particles of the medium oscillate up and down perpendicular to the direction of motion of wave. crests and troughs are formed. Examples of transverse wave: light wave, wave on a string.
An electromagnetic wave is a transverse wave. It can travel in both space as well as medium. It travels with the speed of light in space and slows down in medium.
In longitudinal wave, the particles of the medium oscillate to and fro parallel to the direction of the motion of wave. Example: sound wave
A sound wave is mechanical wave. It requires medium to travel. A sound wave is longitudinal wave. Sound wave travels forward by compression and rarefaction of the medium.
Thus, the title 1 should be transverse wave and title 2 should be longitudinal wave.