Physics
The speed of ultrasound in air is :
- the same as audible sound
- less than audible sound
- more than audible sound
- equal to the speed of light
Related Questions
A man can hear a sound of frequency :
- 1 Hz
- 1000 Hz
- 200 Hz
- 5 MHz
The human ear is most sensitive in the range of …………… where it can hear a feeble sound.
- 1000 Hz — 1500 Hz
- 1500 Hz - 1800 Hz
- 2000 Hz - 3000 Hz
- 100 Hz - 500 Hz
Echo-cardiography is used to obtain the image of
- lungs
- liver
- heart
- kidney
Elephants produce ……………sound :
- ultrasonic
- infrasonic
- supersonic
- none of the above