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

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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

Answer: A