Intensity in Physics: Definition & Measurement


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question 1 of 3

How much brighter is the sun than the full moon? Choose the best approximation.

Hint: Use the apparent magnitude equation to calculate the ratio of intensities given the following apparent magnitudes:

m sub sun = -26.7

m sub moon = -12.6

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1. Calculate the absolute magnitude of the sun given that is apparent magnitude is -26.74 and the earth-to-sun distance is 4.84813*10^-6 parsecs.


Calculate the ratio of intensities of sound waves between a 60 dB conversation and a 35 dB whisper.

Hint: Use the sound intensity level equation, and note that I sub o is a constant.

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About This Quiz & Worksheet

Via multiple example problems, this quiz/worksheet fusion will test your understanding of principles such as apparent magnitude, sound intensity, and absolute magnitude.

Quiz & Worksheet Goals

More specifically, you will be examined on:

  • The brightness comparison between the sun and full moon
  • Your calculation of the sun's absolute magnitude
  • The ratio of intensities between different sound waves

Skills Practiced

  • Reading comprehension - ensure that you draw the most important information from the related lesson on intensity in physics
  • Problem solving - use acquired knowledge to solve practice problems on absolute and apparent magnitude
  • Information recall - access the knowledge you've gained regarding the empirical world

Additional Learning

Want to learn more about intensity in physics? Study the related lesson by the title of Intensity in Physics: Definition & Measurement. This lesson will hone in on topics such as:

  • Measurement and calculation of sound wave intensity
  • Measurement and calculation of electromagnetic wave intensity
  • The necessary formulas for intensity calculation