🔍 Key Concepts

• Amplitude modulation (AM) and what is meant by positive and negative modulation peaks • How the carrier level behaves when modulation is not symmetrical • The specific term used in radio theory when the carrier frequency stays the same but its resting level moves up or down

💭 Think About

• Think about what happens to the average (resting) carrier level if the top and bottom peaks of the modulation envelope are not equal. • Ask yourself: does this situation mainly affect the frequency of the signal, or the shape/position of the carrier amplitude? • Consider which of the options is actually a standard term in radio communications for this condition.

✅ Before You Answer

• Verify which option is a commonly recognized term in AM modulation theory. • Confirm whether frequency is supposed to change when only the symmetry of the amplitude envelope is affected. • Check that the correct choice refers to a change in the carrier’s effective level, not to a change in its frequency.