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Chapter 8: Q. 54 (page 551)

Use a graphing utility to graph the sound emitted by the * key on a Touch-Tone phone. See Problem 53.

Short Answer

Expert verified

The required graph is

Step by step solution

01

Step 1. Given Information

The given figure is

02

Step 2. Explanation

On a touch-tone phone, each button produce a unique sound and the sound produced is the sum of two tones.

For the button key *, the low frequency is 941 cycles per second and high is 1209 cycles per second.

Thus, the sound emitted by touching * is given by,

y=sin(2πlt)+sin(2πht)y=sin(2π(941)t)+sin(2π(1209)t)y=sin(1882πt)+sin(2418πt)

Thus, the graph of the obtained function is

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Most popular questions from this chapter

An object of mass m (in grams) attached to a coiled spring with damping factor b (in grams per second) is pulled down a distance a (in centimeters) from its rest position and then released. Assume that the positive direction of the motion is up and the period is T (in seconds) under simple harmonic motion.

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