Earthquake at two places were measured. The richter scale recorded the intensity as 2 and 4 respectively. If A and B are the magnitude of amplitudes at that places respectively, the amplitude can be compared as:

B = 2A

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B = 4A

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B = 100A

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B = 1000A

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Solution

The correct option is C B = 100A
Richter scale is not a linear scale but a logarithmic scale. In the richter scale the magnitude of next value is 10 times the previous value, like 1, 10, 100, 1000. For example, on this scale the vibration of an earthquake with a magnitude of 2 is 10 times greater in amplitude than an earthquake with magnitude of 1. Similarly a difference in magnitude of '2' implies a multiplication factor of 100 for the amplitude and 1000 times more destructive energy.

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Similar questions

On richter scale, an increase in the magnitude of 4 units means that the destructive amplitude of the earthquake increases by 4 times.

Which of the following statements is/are correct regarding various scales used for measuring the earthquake?

1. Richter scale measures magnitude of earthquake whereas Mercalli scale is used to measure the intensity of earthquake.

2. Magnitude of earthquake depends on the destruction caused by earthquake.

3. Richter scale is a logarithmic scale.

Choose among the options given below:

State whether the following statements are true or false :

(a) Like charges attract each other.

(b) A charged glass rod attracts a charged plastic straw.

(d) Earthquakes can be predicted in advance.

(e) An earthquakes of magnitude 2 on Richter Scale is ten times as strong as an earthquake of magnitude 1 on the same Scale.

(f) The plates of earth's crust are continuously moving.

(g) An earthquake is measured and recorded by using an instrument called electrocardiograph.

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