What is a stethoscope ? Name the principle on which a stethoscope works.
A stethoscope consists of
Which of the following are parts of a stethoscope?
The echo of a sound is heard after 5 seconds. If the speed of sound in the air is 342 m/s. calculate the distance of the reflecting surface.
Explain how, bats use ultrasound to catch the prey.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
What is reverberation ? What will happen if the reverberation time in a big hall is too long ?
What is a bulb horn ? Name the principle on which a bulb horn works.
Explain how flaws (or defects) in a metal block can be detected by using ultrasound.