Question

Sound waves…
I. travel in a vacuum
II. are invisible
III. move through water

I and II

I, II, and III

I and III

II and III

Answer 1

The correct answer is **II and III**.

Here's the reasoning:

I. **Travel in a vacuum** - This is incorrect. Sound waves require a medium (solid, liquid, or gas) to travel through and cannot propagate in a vacuum.

II. **Are invisible** - This is correct. Sound waves cannot be seen; they are a form of mechanical wave that travels through a medium.

III. **Move through water** - This is correct. Sound can travel through water, and in fact, it travels faster in water than in air.

So the correct answer is **II and III**.