What does the forward and backward motion of a coil spring represents?
A. Transverse wave
B. Longitudinal wave
C. Periodic Wave
D. Electromagnetic wave

What kind of waves can he formed on the surface of the water?
A. Transverse wave
B.Longitudinal wave
C. Periodic Wave
D. Combination of transverse and longitudinal wave

In a transverse wave,what is the direction of the wave?
A. Parallel to the direction of the source
B. Perpendicular to the direction of the source
C. Back and forth
D. Upward and downward​