The average sound intensity inside a busy restaurant is 3.10 10-5 W/m2. How much energy goes into each ear (area = 2.1 10-3 m2) during a 1 h

Question

The average sound intensity inside a busy restaurant is 3.10 10-5 W/m2. How much energy goes into each ear (area = 2.1 10-3 m2) during a 1 hour meal?

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Nho 5 years 2021-08-29T17:05:25+00:00 2 Answers 64 views 0

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  1. Doris
    0
    2021-08-29T17:06:34+00:00
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    Answer:

    2.344×10⁻⁴ J

    Explanation:

    Energy: This can be defined as the ability or the capacity to do wok.

    The S.I unit of energy is Joule(J).

    From the question,

    E = P×t………….. Equation 1

    Where E = amount of energy that goes into the ear, P = power, t = time.

    But,

    P = I×A………….. Equation 2

    Where I = sound intensity, A = cross sectional area.

    Substitute equation 2 into equation 1

    E = I×A×t……………. Equation 3

    Given: 3.1×10⁻⁵ W/m², A = 2.1×10⁻³ m², t = 1 hour = 1×60×60 =  3600 s

    Substitute into equation 3

    E = 3.1×10⁻⁵× 2.1×10⁻³× 3600

    E = 2.344×10⁻⁴ J.

  2. giabao
    0
    2021-08-29T17:07:17+00:00
    Reply

    Explanation:

    Below is an attachment containing the solution.

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