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2.4.2 Test (CST): The Movers and Shakers
Question 4 of 15
The seismic waves in a 7.5 magnitude earthquake are
those in a 6.5 magnitude earthquake.
A. 32
B. 100
C. 10
1.000
times larger than



Answer :

The seismic waves in a 7.5 magnitude earthquake are \[\boxed{100}\] times larger than those in a 6.5 magnitude earthquake. Explanation: - Earthquake magnitudes are measured on a logarithmic scale. This means that each whole number increase in magnitude represents a tenfold increase in amplitude of the seismic waves and approximately 31.6 times more energy released. - Therefore, the difference in magnitudes between a 7.5 and a 6.5 earthquake is 1 (7.5 - 6.5 = 1). - Since each whole number increase represents a tenfold increase, the seismic waves in a 7.5 magnitude earthquake would be 10 times larger than those in a 6.5 magnitude earthquake. - Therefore, 10 times larger translates to \[10 \times 10 = \boxed{100}\] times larger, indicating that the correct answer is option B.