Chapter 14.3, Problem 39HP

To determine

To explain: The sum and difference identities are used to describe wireless internet interferences.

Explanation of Solution

Given:

The explanation should include the explanation of the difference between constructive and destructive interference.

For the determination of the wireless internet interference, it uses the sine/cosine of the sum/difference of 2 angles.

Since, the interference occurs at a time where the wave passing from the same space at same time.

It occurs when the two waves combine to have the greater or smaller amplitude than a component waves.

If the amplitude of the combined wave is greater then the constructive interference will occur.

And if the amplitude is smaller then the destructive interference will occur.