A Sound Wave Radiates from a Source Uniformly in All

question 79

Multiple Choice

A sound wave radiates from a source uniformly in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is

• A) 98.5 dB.
• B) 92.0 dB.
• C) 91.5 dB.
• D) 89.6 dB.
• E) 88.3 dB.

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Definitions:

Loanable Funds

The money available for borrowing; the market where savers supply funds for loans to borrowers.

Supply

A relation between the price of a good and the quantity that producers are willing and able to sell per period, other things constant.

Demand

Refers to the quantity of a good or service that consumers are willing and able to purchase at various price levels over a given period of time.

Interest Rate

The percentage charged on borrowed money or paid on savings accounts, essentially the cost of borrowing money or the reward for saving.