The loudness L of a sound (measured in decibels dB) is inversely proportional to the square of the distance d from the source of the sound. Suppose a person who is 4 ft from a hair dryer experiences a sound level of 60 dB. Find the proportionality constant and write the equation that expresses the inverse proportionality.

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.