Ultrasound Physics II Practice Exam

Which expression represents the frame rate formula?

Tframe × Frame Rate = 1 Frame Rate × Tframe = 2 Tframe ÷ Frame Rate = 1 Frame Rate = Time per frame

Correct Answer:

Tframe × Frame Rate = 1

Explanation:

Frame rate and time per frame are reciprocal concepts: how many frames appear each second versus how long one frame lasts. Because they are inverses, their product equals 1 (the units cancel). That means the correct expression is Tframe × Frame Rate = 1. For example, at 60 frames per second, each frame lasts 1/60 of a second, and 60 × (1/60) = 1. The other forms distort this relationship: dividing Tframe by Frame Rate would not yield 1, and saying Frame Rate equals Time per frame treats them as equal rather than inverses.

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