Physics

3. ________is used to break small stones in kidney into fine grains which are later flushed out with urine.
7. Sounds of frequency less than 20 Hz are
8. A wave in which particles vibrate in a direction perpendicular to that of wave propagation is called
10. The persistence of sound caused by multiple echoes
12. The way in which brain interprets the frequency of emitted sound is called its
15. _________is defined as the amount of energy passing through a unit area per unit time.

1. The number of complete wave cycles occurring per unit time is called
2. Sonic booms are caused due to the variation of
4. ________is defined as the maximum displacement of a particle from its mean position during vibrations.
5. __________is determined by amplitude of the sound.
6. It is the distance between two consecutive compressions or rarefactions in the wave.
9. ________is a form of energy which produces a sensation of hearing in our ears.
11. ________is caused by reflection of sound from given surfaces.
13. The time taken by one complete wave cycle is
14. The instruments Megaphone, Stethoscope, Hearing aids and Sound boards work based on the principle of