Intensity , or loudness of sound, is measured in decibels .
Pitch is measured in frequency of sound vibrations per second.
A low pitch such as a deep voice or a tuba makes fewer vibrations per second than a high voice or violin. Decibels are measured logarithmically . This means that as decibel intensity increases by units of 10, each increase is 10 times the lower figure. Each increase of 5 decibels doubles the loudness in your ear. For example, being exposed to a 90 decibel noise for eight minutes is the same as being exposed to a 95 decibel noise for four minutes.