The duty factor for CW ultrasound is

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Multiple Choice

The duty factor for CW ultrasound is

Explanation:
Continuous wave ultrasound is emitted without any off time, so the beam is on during the entire cycle. The duty factor is defined as the fraction of time the beam is on during one cycle (on-time divided by total cycle time). Since the on-time equals the total time for CW, the duty factor is 1.0 (100%). The other options don’t fit: 1% would be a highly pulsed beam with only a tiny fraction on, 0.0 would mean never emitting, and 10.0 would exceed the 0–1 range used for duty factors. Therefore, the duty factor for CW ultrasound is 1.0.

Continuous wave ultrasound is emitted without any off time, so the beam is on during the entire cycle. The duty factor is defined as the fraction of time the beam is on during one cycle (on-time divided by total cycle time). Since the on-time equals the total time for CW, the duty factor is 1.0 (100%). The other options don’t fit: 1% would be a highly pulsed beam with only a tiny fraction on, 0.0 would mean never emitting, and 10.0 would exceed the 0–1 range used for duty factors. Therefore, the duty factor for CW ultrasound is 1.0.

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