Two People Are Talking at a Distance of 3

question 42

Multiple Choice

Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10^-7 W/m².Another student is 4.0 m away from the talkers.What sound intensity does the other student measure? Assume that the sound spreads out uniformly and undergoes no significant reflections or absorption.

• A) 6.2 × 10^-8 W/m²
• B) 1.5 × 10^-7 W/m²
• C) 8.3 × 10^-8 W/m²
• D) 7.8 × 10^-7 W/m²
• E) 2.5 × 10^-8 W/m²

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Definitions:

Stratum Lucidum

A thin, clear layer of dead skin cells in the epidermis found only in areas of thick skin, like the palms and soles.

Melanocyte

A cell located in the bottom layer of the skin's epidermis and in the eye, responsible for producing melanin, the pigment that colors the skin, hair, and eyes.

Epidermis

The outermost layer of the skin, consisting of keratinized, stratified squamous epithelium that functions as a barrier against environmental damages.

Sebaceous Gland

A small oil-producing gland present in the skin of mammals which secretes a lubricating oily matter (sebum) into the hair follicles to lubricate the skin and hair.