Sound — practice question

Bats emit ultrasound waves in order to navigate. What frequency range could these waves have?

• A$0\text{-}20\,\text{Hz}$
• B$20\,\text{Hz}\text{-}2000\,\text{Hz}$
• C$2\,\text{kHz}\text{-}20\,\text{kHz}$
• D$20\,\text{kHz}\text{-}120\,\text{kHz}$