1001 Space Earth Nature History Human World Science and Technology Chemistry Materials Force and Energy Heat and Light Electricity and Magnetism Industry Machines Electronics and Computers Cars and Trucks Railways Ships Aircraft Fishing and Agriculture Undersea Exploration

Choose a Page:What is energy?What is a force?Why is the Sun's energy so important?Why are forces important in sports?What is friction?*How is sound energy measured?*What is nuclear energy?Which forces act on a jet aircraft?What is gravity?Can one form of energy be changed ...How are force and energy measured?What is the difference between mas...How does a turbine work? How is sound energy measured? The amount of energy in a sound wave depends on its intensity or loudness, measured in decibels. The quietest sound we can hear is given a value of 0 decibels (0 dB). The rustle of leaves has a loudness of 10 dB, and conversation is about 55 dB. Sounds over 100 dB begin to cause us pain. The loudness of a jet fighter's engines is 170 decibels, which is beyond the pain threshold.   Previous: Back Book: 1001 Section: Science and Technology Chapter: Force and Energy