Question

97. A tsunami occurs 1000 km away from the
shore in an ocean water depth of 6.25 km.
The tsunami reaches the shore in about:
B. 2 hr
D. 8 hr
A. 1 hr
C. 4 hr​

Answer 1

Answer:

97. A tsunami occurs 1000 km away form the shore in an ocean water depth of 6.25km. The tsunami reaches the shore in about

a) 1hr

b) 2hr

c) 4hr

d) 8hr

Solution:

Velocity of the Tsunami wave (V) = (√g*d) --------------------(1)

g = acceleration due to gravity (9.8 m/s2)

d = depth (6250 m)

V= (√9.8 * 6250)

V= 247.48 m/s

The Tsunami reaches the shore at time(t) = distance/ velocity ---------(2)

Distance= 1000000 m

velocity = 247.48 m/s

time= (1000000/ 247.48)

= 4040s

Therefore time= 1hr 7min

Explanation:-

Tsunami:-

A tsunami is a very long-wavelength wave of water that is generated by sudden displacement of the sea floor or disruption of any body of standing water. Tsunami are sometimes called "seismic sea waves", although they can be generated by mechanisms other than earthquakes.

Physical Characteristics of Tsunami

All types of waves, including tsunami, have a wavelength, a wave height, an amplitude, a frequency or period, and a velocity.

Wavelength is defined as the distance between two identical points on a wave (i.e. between wave crests or wave troughs). Normal ocean waves have wavelengths of about 100 meters. Tsunami have much longer wavelengths, usually measured in kilometers and up to 500 kilometers.

Wave height refers to the distance between the trough of the wave and the crest or peak of the wave