What happens to high peaks and valleys of intensity as distance increases?

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Multiple Choice

What happens to high peaks and valleys of intensity as distance increases?

Explanation:
As distance from the source increases, the energy pattern tends to smooth out. The peaks and valleys you see are caused by how the waves interfere and how the beam diverges from the transducer. When you move farther away, the wavefronts spread over a larger area and many interference contributions average out across that area, so the variation from one point to another becomes less pronounced. The overall intensity still falls off with distance due to geometric spreading and attenuation, but the distribution becomes more uniform.

As distance from the source increases, the energy pattern tends to smooth out. The peaks and valleys you see are caused by how the waves interfere and how the beam diverges from the transducer. When you move farther away, the wavefronts spread over a larger area and many interference contributions average out across that area, so the variation from one point to another becomes less pronounced. The overall intensity still falls off with distance due to geometric spreading and attenuation, but the distribution becomes more uniform.

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