Suppose a sound of frequency 1200 Hz is emitted from a speaker 15 meters away fr

Question

Suppose a sound of frequency 1200 Hz is emitted from a speaker 15 meters away from you. At YOUR location, the intensity is 1.0E-5 W/m2. Let me assume your eardrum has area 5E-5 m2. If the sound continues for 5 seconds, what total amount of energy is received by your ear?
Find your answer in Joules, but do not enter units. If your answer is 1.4E-12 J, enter 1.4E-12. Please be careful: CAPA is picky about how you input numbers in exponential notation. There must not be any space between the number and the "E", and no space AFTER the E either. To think about -- Do you suppose this level of energy deposit would be harmful to you?

Explanation / Answer

total energy = intensity*area of ear drum* time = 1*10-5*5*10-5*5 = 25*10-10 joules

hence answer is

25E-10

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