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Praxis II General Science

Category - Physics

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Jack is yelling at a decibel level of 70. How much louder is this than his normal speech at 50 decibels?

2 times
4 times
10 times
100 times
1000 times

Explanation

Answer: D - The decibel is a log scale, and 70 decibels has a power ratio of 10,000,000 whereas 50 decibels has a power ratio of 100,000, 100 times less. In essence, 60 decibels is 10 times louder than 50, and 80 decibels is 1000 times louder than 50.

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