In a cave at a frequency of 42,000 Hz
sound waves
ultrasonic sound waves
Light waves
coz they can.
ultrasonic waves help bats to see at night
ultrasonic sound waves
They use a machine
Sound is actually a series of sound waves or vibrations. These waves pulse against the eardrum, which the bones to the ear send to the brain as sounds. Acoustics in audio equipment convert sound on a record back into sound waves.
Bats produce high frequency (also known as ultrasonic) sound waves, which they use as a type of sonar, to locate insects in the air.
an amplifier
by sound waves they send out
sound waves because sound travels faster than water