At a Distance of 2

question 49

Multiple Choice

At a distance of 2.00 m from a point source of sound,the intensity level is 80.0 dB.What will be the intensity level at a distance of 4.00 m from this source? The lowest detectable intensity is .

• A) 77.0 dB
• B) 74.0 dB
• C) 60.0 dB
• D) 40.0 dB
• E) 20.0 dB

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Definitions:

Pericycle

A layer of cells in plant roots located just inside the endodermis, capable of giving rise to lateral roots and contributing to the root's growth.

Monocots

A group of flowering plants characterized by having one seed leaf, or cotyledon, which influences the structure of their stems, leaves, and roots.

Eudicots

A major group of flowering plants characterized by the presence of two (di-) cotyledons, or seed leaves, in their seeds.

Pith

The central core of certain plants' stems and branches, consisting of soft, spongy parenchyma cells.