Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Physics Waves Transverse and longitudinal waves
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