12.3: Intensity and Loudness of Sound It’s All About Energy. Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is. Decibel Levels. The Figure below shows decibel levels of several different sounds. As decibel levels get higher, sound. Amplitude and Distance..

The electric field is said to be the gradient (as in grade or slope) of the electric potential. Figure 7.5.1: The electric field component along the displacement Δs is given by E = − ΔV Δs. Note that A and B are assumed to be so close together that the field is constant along Δs.

The average intensity of an electromagnetic wave Iave can also be expressed in terms of the magnetic field strength by using the relationship B= E c B = E c, and the fact that ϵ0 = 1 μ0c2 ϵ 0 = 1 μ 0 c 2, where μ0 is the permeability of free space. Algebraic manipulation produces the relationship.

1. Push-up Image by Dima Bazak How to do it: Start in high plank position, with hands under shoulders. Drop your chest to the floor. Keeping your abs nice and tight, use your arms and core to.