CBSE Pathshala

CBSE NCERT IX-Physics for term-II Chapter: Sound key points 1. Sound is a wave that is created by vibrating objects and propagated through a medium from one location to another.  2. A disturbance that travels through a medium, transporting energy from one location to another location is called wave. The medium is simply the material through which the disturbance is moving; it can be thought of as a series of interacting particles.  3. In our body Vocal cord is vibrating body that produce sound wave.  4. The sound wave is transported from one location to another by means of particle-to-particle interaction like air particles in air.  5. Air particles interact continuously throughout the entire medium that causes disturbance to its nearest neighbours till sound reach to listener.  6. A sound wave is a disturbance that is travel through a medium via the mechanism of particle-to-particle interaction. Hence sound wave is characterized as a mechanical wave....

JSUNIL TUTORIAL, BIHAR IX CH – SOUND QUESTIONS - 1 (Q)1. Fill in the blanks: (a) The loudness of sound is proportional to the _________ of the amplitude of the vibration. (b)The speed of sound __________as it moves from solid to gaseous state. (c) In any medium the speed of sound __________ with increase in temperature. (d) The distance between two consecutive compression or two consecutive rarefaction is called the ____. (e) The change in the density or pressure from a maximum value to minimum and then back to the maximum is called an ___________. (f) The number of periodic oscillations per unit time is called the ________ of the sound wave. (g) Sound is produced due to ________of different objects. (h). Sound travels as a _________ wave through a material medium. (i) Sound travels as successive _________ and ___________ in the medium. 2. Q. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequenci...

9 th Chapter: sound –Guess Questions for practice 1. If you place some small blades on a drum, what will you observe when you beat this drum with a drum stick? Explain. 2. Describe an activity with a (a) metre scale (b) rubber band to show that only a vibrating body produces sound. 3. With the help of tuning fork demonstrate that sound is produced by a vibrating body. 4. What is vibrating in the following musical instruments producing by a musical sound? (a) Violin (b) drum (c) saxophone (d) flute (e) guitar (f) dholak (g) tabla (h) sitar 5. What is medium? What constitutes the medium? 6. Describe an activity to show sound travels faster through a solid medium than through a gaseous medium. 7. Describe an activity to show sound travels faster through a solid medium than through a liquid medium. 8. Describe the experiment to demonstrate that waves do not c...