C The figure of 130 dB for the rock group was measured at the loudspeaker.Suggest why the level would be less than this for most people at the concert. __

The sound level at a concert would be less than 130 dB for most people because the human ear is not equally sensitive to all frequencies and intensities of sound. Some frequencies and intensities of sound are more easily heard than others.

## Step 1The problem is asking us to explain why the sound level at a concert would be less than 130 dB, even though the sound was measured at 130 dB at the loudspeaker. This is a question about sound intensity and how it is perceived by different individuals.## Step 2The decibel scale is a logarithmic scale used to measure sound intensity. It is important to note that the decibel scale is not a linear scale, but a logarithmic one. This means that each increase in 10 dB represents a tenfold increase in sound intensity.## Step 3However, the human ear does not perceive sound intensity in a linear fashion. Instead, it perceives sound intensity in a logarithmic fashion. This means that the human ear is more sensitive to changes in sound intensity than the decibel scale would suggest.## Step 4Therefore, even though the sound was measured at 130 dB at the loudspeaker, the sound level would be less than this for most people at the concert. This is because the human ear is not equally sensitive to all frequencies and intensities of sound. Some frequencies and intensities of sound are more easily heard than others.