SI units

SI units problem 31

  • The intensity of a progressive wave is defined as the average power transmitted through a surface per unit area.

    Show that the SI base units of intensity are .

    • The intensity of a sound wave is related to the amplitude of the wave by:


      is the density of the medium through which the sound is passing,

      is the speed of the sound wave,

      is the frequency of the sound wave, and

      is a constant.

      Show that has no units.

    • Calculate the intensity, in , of a sound wave where:

      = 20,

      = 1.2 in SI base units,

      = 330 in SI base units,

      = 260 in SI base units and

      = .


main author and content editor: Joanah Frank