# 1. If an earthquake wave having a wavelength of 13 km caused the ground to vibrate 10 times each...

## Question:

1. If an earthquake wave having a wavelength of 13 km caused the ground to vibrate 10 times each minute, what is the speed of the wave?

a. 1.2 km/s

b. 2.2 km/s

c. 220 m/s

d. 22 m/s

2. If the amplitude in a sound wave is doubled, by what factor does the intensity of the wave increase?

a. 2

b. 1

c. 8

d. 4

## Speed, Intensity of a Wave:

{eq}\\ {/eq}

The speed of a wave depends only on the medium of the propagation of the wave. The frequency/time-period of a wave is determined by the source of the production of the wave, while the wavelength is determined by the velocity of the wave in the medium, and its frequency. Therefore, the three quantities are related together.

The intensity of a wave is the measure of the rate of flow of energy through a unit area perpendicular to the direction of the flow. It is determined by the amplitude, frequency and the speed of the wave.

## Answer and Explanation: 1

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View this answer{eq}\\ {/eq}

**a)** We are given:

- The wavelength of the wave, {eq}\lambda=13\;\rm km=1.3\times 10^{4}\;\rm m {/eq}

- The number of vibrations in,...

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Chapter 12 / Lesson 2Explore wave propagation. Learn the definition of wave propagation and discover its different directions. Find the factors that affect wave propagation speed.

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