What name is given to the sound waves of frequency too high for humans to hear ?
Ultrasound cannot be heard by humans. Ultrasound has frequencies more than 20 kHz.
(a) What is the upper limit of frequency of human hearing ?
(b) What is the lower limit of frequency of human hearing ?
(c) Name one animal which can produce ultrasonic sounds.
(d) Name two animals which can hear ultrasonic sounds.
What name is given to sound waves of frequencies higher than 20 kHz?