1. Std:- 9 Sub:-Science Unit-Solid Waste: Ecofriendly Manegement Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

2. Std:- 9 Sub:-Science Unit-Solid Waste: Ecofriendly Manegement Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

3. Std:- 9 Sub:-Science Unit-Solid Waste: Ecofriendly Manegement Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

4. Nature of sound Sound is a form of energy which produces sensation of hearing in our ears. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

5. PRODUCTION OF SOUND Sound is produced by striking, plucking & blowing. Sound is produced from object like scratching, rubbing, flapping & shaking. Vibration in the object Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

6. PROPAGATION OF SOUND Sound also get propagated in the form of waves. Sound is produced when an object is gets starts vibrating. Sound is transmitted through matter. It can be solid, liquid & gas. Sound cannot travel through vacuum. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

7. SOUND WAVES ARE LONGITUDINAL WAVES The propagation of distrubance in a slinky can be simulated to sound propagation. These waves are longitudinal waves. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

8. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

9. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

10. Range of hearing in humans Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

11. Ultrasound Sound waves have frequencies greater than 20000 Hz are called ultrasound. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

12. Uses of ultrasound 1) In establish ship. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

13. 2) In welding plastic machine Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

14. 3) To gives the image of organs of human body. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

15. 4) To cleaning industrial machine Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

16. Reflection of sound Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

17. Echo Echo is repetition of sound due to reflection of original sound from any surface Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

18. SONAR SONAR is an acronym for Sound Navigation And Raging. SONAR measure the distance, direction & speed of under water object. SONAR consists of a transmitter & a detector. It determine the depth of the sea Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

19. THE HUMAN EAR Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

20. THE HUMAN EAR Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

21. THE HUMAN EAR Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.

22. SOUND Vibration produces Waves reflection Echo repeat reverberation Jumbling & Prolonged Sound in hall Use of sound absorbent Material in roofs & walls of hall Frequency X wavelength Mechanical waves Longitudinal waves Transverse waves Time period wavelength Pitch frequency Amplitude Loudness intensity

23. frequency Infrasound Audible sound Ultrasound <20 Hz 20 Hz to 20000 Hz 20000 Hz

24. Std:- 9 Sub:-Science Unit-Music of Sound Rayat Shikshan Sanstha,Maharaja Sayajirao Vidyalaya,Satara.