What is not correct about ultrasonic waves ? 

1
Frequency is very high about 20,000 Hz 
2
Human ear can hear them
3
Wavelength of these waves is very low 
4
More than one of the above
5
None of the above

Sponsored

hivanix.in

Visit

This quiz is brought to you by hivanix.in

🌐 Web App Development

Quick Navigation