What is true about surface waves? a. the disturbance does not have a specific motion. b. the disturbance is in a circular motion. c. the disturbance is only perpendicular to the motion of the wave. d. the disturbance is only parallel to the motion of the wave.

The correct answer is B.

Explanation:

In longitudinal wave, the vibrations of the particle of the medium is parallel to the direction of the motion of the wave.

In transverse wave, the vibrations of the particle of the medium is perpendicular to the direction of the motion of the wave.

In surface wave, the particles of the medium undergo circular motion. The surface wave is neither longitudinal nor transverse.

Therefore, surface waves are the disturbances which travel in the circular motion.

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

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