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Chapter 36: Q.32 (page 1047)

How would a rise in altitude likely affect the speed of a sound transmitted through air? Why?

Short Answer

Expert verified

Sound moves more slowly at high elevations because the air is much cooler there. Also, Because sound travels via particles (gas), and higher altitudes have fewer particles (lower density), the sound would travel more slowly.

Step by step solution

01

Step 1. Introduction 

The density and stiffness of the medium work together to control the speed of sound in that medium. The speed of sound increases with the rigidity of the medium. Analytical representations of sound speed as a function of altitude are typically challenging. We can therefore assume that the key variables impacting the speed of sound at greater altitudes are temperature, pressure, and humidity.

02

Step 2. Explanation 

Temperature is the key factor affecting sound speed in the air. Sound moves at a speed of around 1,220 kilometers per hour (760 miles per hour) at an average sea level temperature. Sound moves more slowly at high elevations because the air is much cooler there. Also, Because sound travels via particles (gas), and higher altitudes have fewer particles (lower density), the sound would travel more slowly.

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