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waves in which the vibrations swing back and forth perpendicular to the direction that the wave travels are called

a. mechanical waves
b. transverse waves
c. standing waves
d. longitudinal waves

Waves in which the vibrations swing back and forth perpendicular to the direction that the wave travels are called transverse waves.

Option B

Explanation:

In the transverse waves, the displacement of particles is perpendicular to wave propagation's direction. The particle does not move with the waves; when the wave passes, they simply oscillate up and down in individual equilibrium positions.

In Earthquake, S waves (secondary waves) are the best example to the transverse wave. S waves spread more slowly than P waves and later arrive in a few seconds. A classic example, the wave from a long rope. The waves move from rope’s one end to the end of other, but the real rope goes up and back, not like a wave from left to right.

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