ARDMS Ultrasound Physics & Instrumentation Practice Exam

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Prepare for the ARDMS Ultrasound Physics and Instrumentation Exam with flashcards and multiple choice questions. Each question includes hints and explanations to optimize your study efforts. Get ready to succeed in your exam!

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What is the change in intensity if the power decreases by half?

Intensity is doubled
Intensity remains unchanged
Intensity is halved
Intensity is increased by half

The correct answer is: Intensity is halved

When power is reduced by half, the intensity also decreases. Intensity is defined as power per unit area. The mathematical relationship between power and intensity can be expressed as: Intensity (I) = Power (P) / Area (A) If the power decreases by half while the area remains constant, the new intensity can be calculated as follows: Original Intensity = Power / Area New Intensity = (Power / 2) / Area = (1/2) * (Power / Area) = (1/2) * Original Intensity Thus, the new intensity is half of the original intensity, confirming that if the power decreases by half, the intensity is also halved. This relationship is fundamental in understanding how power changes affect intensity in ultrasound and other wave-related fields.