Two sinusoidal signals have the same amplitude (A) and the same frequency (f). They differ in phase by 180 degrees.

Two sinusoidal signals have the same amplitude (A) and the same frequency (f). They differ in phase by 180 degrees.

If these two signals are added together, the result is a sinusoidal signal having an amplitude of:
A . Zero
B . 0.707A and a frequency of f
C . A and a frequency of 2f
D . 2A and a frequency of f
E . 2A and a frequency of 2f

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Answer: A