# Chapter 14 - Exercises and Problems - Page 273: 85

c. 640 kilometers per hour.

#### Work Step by Step

As we know that velocity of tsunami for depth d is $v=\sqrt{gd}=450\frac{Km}{h}$ so velocity of tsunami for depth 2d is $v^{\prime}=\sqrt{2gd}$ $\implies v^{\prime}=\sqrt{2} \space gd$ $\implies v^{\prime}=\sqrt{2}\times 450\approx 640\frac{Km}{h}$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.