Lesson: Sound Wave Power and IntensityPhysics
In this lesson, we will learn how to relate sound intensity level in decibels to sound wave intensity, amplitude, and pressure changes that waves produce.
Sample Question Videos
The energy of a ripple on a pond is proportional to the amplitude squared. If the amplitude of the ripple is 0.100 cm at a distance from the source of 6.0 meters, what was the amplitude at a distance of 2.0 meters from the source?
The low-frequency speaker of a stereo set has a surface area of and produces 1 W of acoustical power.
What is the intensity at the speaker?
If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.1 W/m2?
A microphone receiving a pure sound tone is connected to an oscilloscope, producing a wave on its screen. The sound intensity is originally mW/m2 but is increased until the amplitude shown by the oscilloscope increases by . What is the intensity of the sound after the amplitude increases?