What are Decibels? - Definition & Examples


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1. A power ratio of 100 dB is 100 times more intense than a 70-dB power ratio.

2. At what decibel level does sound become dangerous to hearing?

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About This Quiz & Worksheet

Test your understanding of decibels and their relationship to hearing in this quiz and worksheet combo. Practice questions assess your ability to calculate decibels.

Quiz & Worksheet Goals

Use this quiz to assess your ability to:

  • Define decibel and bel
  • Explain the power ratio of different decibel measures
  • Identify the decibel level when sound is dangerous to hearing
  • Calculate decibel levels

Skills Practiced

This assessment will test the following skills:

  • Critical thinking - apply relevant concepts to examine information about sound in a different light
  • Problem solving - use acquired knowledge to solve decibel level practice problems
  • Interpreting information - verify that you can read information regarding decibel levels and interpret it correctly
  • Defining key concepts - ensure that you can accurately define bel and decibel
  • Information recall - access the knowledge you've gained regarding decibels

Additional Learning

Learn more about sound in this interactive lesson on the characteristics of decibels. Topics in this lesson are:

  • Decibel and bel
  • Mathematical expression of the decibel scale
  • The expression of power and amplitude ratios