Lesson: Chapter 4 — Waves and their applications

4.3.4. Hearing range and ultrasound 3 of 5 Reset answers

Clear all your answers?

This erases every answer in this set and starts you again at question one. Your score will be gone.

Type these four numbers to confirm:

Those numbers don't match. Look at them again and type them.

Yes, clear Keep them

Question 3

How does a bat avoid obstacles in the dark?

A It gives out ultrasound and picks up the waves reflected by the obstacles B It hears infrasound from the ground C It sees them with infrared D It feels the air move

The right answer is the one marked above.

It gives out ultrasound and picks up the waves reflected by the obstacles. The returning waves tell it where each obstacle is.

Answer the question to continue.