Rayat Shikshan Sanstha Maharaja Sayajirao Vidyalaya Satara Our

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

Rayat Shikshan Sanstha , Maharaja Sayajirao Vidyalaya, Satara. Presented By Mrs. Chavan V. S. B. Sc. B. Ed. (A) Std: - 9 Sub: -Science Unit-Solid Waste: Ecofriendly Manegement

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

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

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

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

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

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

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

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

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

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

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

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

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

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