Definition Of Amplitude

Amplitude is half the distance between the minimum and maximum values of the range of a periodic function with a bounded range.

In other words, for functions of the form y = A sin bθ or y = A cos bθ, the amplitude is |A|.

Examples of Amplitude

Video Examples: Free Math Lessons Sine Graph Amplitude

Solved Example on Amplitude

Ques: Find the amplitude of the function .

Choices:

A. - 4 
B. 4 
C. 1/2
D. - 3 
Correct Answer: B

Solution:

Step 1: Recall that "for functions of the form y = A cos bθ, the amplitude is |A|". 
Step 2: So, 4 is the amplitude of the given function.

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