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How many times louder is a 60dB sound than a 20dB sound? How many times more energy is released by a magnitude 6 earthquake than

How many times louder is a 60dB sound than a 20dB sound?

How many times more energy is released by a magnitude 6 earthquake than by a magnitude 2 earthquake?

When you are 2 meters away from the speakers at a concert, the sound level is 130db. How far away should you sit to reduce the level to 110dB?

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