Question

The image below shows the graph of a sound recorded on an oscilloscope. What are the period and the amplitude? (Each unit on the t-axis equals 0.01 seconds.)

A. 0.025 seconds; 4.5
B. 0.05 seconds; 9
C. 0.025 seconds; 9
D. 0.05 seconds; 4.5

Answer 1

The answer is b) 0.05 seconds; 4.5

Answer 2

D. 0.05 seconds; 4.5

Explanation:

Period-

It is the horizontal distance required for the graph of a periodic function to complete one cycle.

Amplitude-

It is the height from the center line to the peak. It can be calculated by taking the average of highest and lowest points.

From the graph it can be seen that the value of the graph repeats itself after 0.05 seconds, so its period is 0.05 sec.

The maximum point of the graph is located 4.5 units away from the mean line. Hence its amplitude is 4.5