Physics for IGCSE & O level - Waves And Sounds (Section 1 - No. 4)
What is 'echo-location' in terms of bats?
The bat's ability to see in the dark.
The bat's use of ultrasound to locate objects.
The bat's ability to fly very fast.
The bat's hearing ability.
Explication
Echo-location is the bat's use of ultrasound to find objects.