More cards in this set

What is the frequency of ultrasound waves?

How are ultrasound images produced by electronic systems?

Why are ultrasound scans safer than an x-ray?

How is ultrasound used in hospitals?

What is refraction?

Why does refraction take place?

What is the refractive index of a substance?

Which way does a light ray change direction when it crosses from glass to air?

What happens when the angle of incidence is increased?

What is the critical angle?