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up vote 1 down vote favorite. 1. The intensity of a wave is proportional to the square of the amplitude of the AND the frequency of the wave given by the equation: Now when talking about sound waves the sound level of a noise (loudness), it is proportional to the intensity of the source.
Sound intensity also gives a measure of direction as there will be energy flow in some directions but not in others. Therefore sound intensity is a vector quantity as it has both magnitude and direction. On the other hand pressure is a scalar quantity as it has magnitude only.