ARDMS Ultrasound Physics & Instrumentation Practice Exam

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Prepare for the ARDMS Ultrasound Physics Exam. Use flashcards and multiple-choice questions with hints and explanations. Get exam-ready!

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What is the change in power if the amplitude of a wave triples?

It remains the same
It increases by three times
It increases nine times
It decreases by half

The correct answer is: It increases nine times

The correct change in power when the amplitude of a wave triples is indeed an increase of nine times. This can be understood through the relationship between amplitude and power in wave physics. Power is proportional to the square of the amplitude. This means that if the amplitude is multiplied by a factor, the power changes by the square of that factor. In this case, if the amplitude triples, the relationship can be expressed mathematically as follows: 1. Let the original amplitude be represented as A. 2. If the amplitude increases to 3A (triples), the power, which is proportional to the square of the amplitude, becomes (3A)² = 9A². Therefore, the new power is nine times the original power. This understanding of amplitude and power is crucial in grasping many concepts in ultrasound physics, such as intensity and energy transmission in waves. The other choices do not reflect the relationship between amplitude and power accurately.