Question

An earthquake in San Francisco produces a wave with a period of 0.80 seconds and a wavelength of 40 m., How long will it take for this earthquake to reach Los Angeles if the displacement between these cities is 560 km? A) 3.11 Hrs B) 1.2 hrs C) 42 minutes D) 11.2 seconds

Answer 1

Answer:

A) 3.11 Hrs

Explanation:

Wave speed is given by the formula

$Speed = \frac{wavelength}{Time\: period}$

now we will have

$speed = \frac{40}{0.80}$

$v = 50 m/s$

now the time taken by the wave to move the distance 560 km is given as

$t = \frac{distance}{speed}$

$t = \frac{560\times 10^3}{50}$

$t = 11200 s$

t = 3.11 hours