Which statement is true about continuous wave mode?

• A. It maintains a constant amplitude while on
• B. It is pulsed
• C. It is frequency-modulated
• D. It is digital

Answer: (A)

Continuous wave mode means the device emits a signal continuously without turning off between bursts. Because it stays on and, in the simplest case, at a fixed power level, the amplitude remains constant over time. The other statements describe features that aren’t inherent to continuous wave mode: it isn’t pulsed (that would be intermittent emission), it isn’t necessarily frequency-modulated (that would be a separate modulation—FM—applied to a continuous signal), and it isn’t digital (digital implies discrete levels rather than a continuous waveform). If frequency modulation is applied, you’d have FM-CW, which is still continuous in time but changes in frequency, not a true reflection of the basic continuous wave mode.