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What is the frequency of ultrasound?

What is the range of human hearing?

What happens to ultrasound waves when they meet a boundary between 2 different media

How can ultrasound be used in medicine?

s = v x t

How do ultra sounds break down kidney stones?

What is refraction?

How does a lens form an image?

What is the distance from the lens to the principle focus called?

Refractive Index =