Question

Light waves refract when they change _________.
Responses
A speedspeed
B energyenergy
Question 2
Changes in the __________ of the medium through which a wave travels can cause the wave to either speed up or slow down.
Responses
A massmass
B densitydensity
Question 3
Sound waves bending across a lake on a cold morning is an example of sound wave _______.
Responses
A refractionrefraction
B reflectionreflection
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Answer 1

Here are the answers to your questions:

**Question 1:** Light waves refract when they change **A. speed**.

**Question 2:** Changes in the **B. density** of the medium through which a wave travels can cause the wave to either speed up or slow down.

**Question 3:** Sound waves bending across a lake on a cold morning is an example of sound wave **A. refraction**.