# Calculate the increase in sound level resulting from using an ear trumpet to aid in hearing. Take the effective area of the trumpet to be 900 cm2, the eardrum’s area to be 0.500 cm2, and assume the trumpet is 5.00% efficient in routing the sound to the eardrum.

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Calculate the increase in sound level resulting from using an ear trumpet to aid in hearing. Take the effective area of the trumpet to be 900 cm2, the eardrum’s area to be 0.500 cm2, and assume the trumpet is 5.00% efficient in routing the sound to the eardrum.

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Step 1

The equation for the intensity of sound is

For sound having same power, the relation between the area and intensity is

Step 2

The trumpet is 5.00% efficient in routing the sound to the eardrum, the ratio of intensity of sound is

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