Adolphin in seawater at a temperature of 25°c emits a sound wave directed toward the ocean floor 154 m below. how much time passes before it hears an echo? (the speed of sound in ocean water is 1533 m/s.)

0.2s

Explanation:

SO for the dolphin to hear its echo, the sound wave must travel a distance twice as much as the displacement between the dolphin and the ocean floor. So d = 154 * 2 = 308 m

Since the speed of sound in ocean floor is v = 1533m/s we can find out the time by dividing the distance d by the speed of sound

t = d / v = 308 / 1533 = 0.2s

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

snell's law

refractve index = sin incidence / sin refraction