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.
