The intensity of the wave change increases by a factor of four.
In physics, the intensity or flux of radiant energy is the transmitted power per unit area measured in the plane perpendicular to the direction of propagation of the energy. The SI system uses the base unit of watts per square meter (W/m2) or kg⋅s−3. Intensity is most commonly used with waves such as sound waves (sound) or electromagnetic waves such as light or radio waves and uses the average power transfer over the duration of the wave. Intensity can be applied to other situations in which energy is transferred.
Intensity can be found by multiplying the energy density (energy per unit volume) at a point in space by the speed at which the energy moves. The resulting vector has power units divided by area (that is, surface power density).
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