Two People Are Talking at a Distance of 3

question 43

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:

Ammonia

A colorless gas with a distinct sharp smell, composed of nitrogen and hydrogen (NH3), used as a fertilizer, in cleaning products, and in the synthesis of various chemicals.

Lewis Structure

A representation of molecules showing all the atoms, valence electrons, and bonding between atoms as well as any lone pairs of electrons.

Lewis Structure

A graphical representation illustrating how atoms in a molecule are bonded together and depicting any unpaired electrons present within the molecule.

Boron Trifluoride

A chemical compound with the formula BF3, known for its role as a strong Lewis acid in organic and inorganic chemical reactions.