During a Typical Workday (Eight Hours), the Average Sound Intensity

question 6

Multiple Choice

During a typical workday (eight hours) , the average sound intensity arriving at Larry's ear is 1.8 × 10^-5 W/m². If the area of Larry's ear through which the sound passes is 2.1 × 10^-3 m², what is the total energy entering each of Larry's ears during the workday?

• A)1.8 × 10^-5 J
• B)2.2 × 10^-4 J
• C)7.4 × 10^-4 J
• D)1.1 × 10^-3 J
• E)4.1 × 10^-3 J

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Definitions:

Discount Rate

In finance, it's the interest rate the Federal Reserve charges banks for borrowing funds, used to control money supply.

Net Present Value

A method used in finance to assess the profitability of an investment by calculating the present value of its expected future cash flows minus the initial investment cost.

Investment

The action of allocating resources, usually money, with the expectation of generating an income or profit.

Interest Rate

The percentage of a sum of money charged for its use, often expressed as an annual percentage on loans or earned on savings.