class 4 ds lesson 3 with simple explaination

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SOUND

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SOUND Main topics covered in this part of CBSE Class 9 Science, Sound: Chapter Notes, are: Sound-Production and Propagation Medium Wave and its Types Characteristics of Sound Audible Frequency Reflection of Sound and its Laws Applications of Reflection of Sound Sound Sound is a form of energy which produces a sensation of hearing in our ears. Production of Sound Sound is produced due to the vibration of objects. Vibration is a periodic back-and-forth motion of the particles of an elastic body or mediumkind about a central position. It is also named as oscillation. For example: Stretched strings of a guitar vibrate to produce sound. When membrane of a table is struck, it vibrates to produce sound. Propagation of Sound The travelling of sound is called propagation of sound. Sound is propagated by the to and fro motion of particles of the medium. When an object vibrates, the particles around the medium vibrate. The particle in contact with the vi
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class 3 s.st lesson 2 something to do

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                      CLASS – 3    S.St Lesson -2   QUESTION - ANSWER D – ANSWER THE FOLLOWING QUESTIONS- Que 1 – List three ways in which the family members can resemble one another. Ans 1- Family members can resemble each other in colour of the skin, shape of the nose, forehead, walking, and talking   etc. Que2 – In what ways are you similar to your family members? Ans 2- My voice is similar to my mother. Que 3 – What confusion can be created if the twins are identical? Ans 3- Sometimes even the parents of the identical twins find it difficult to tell who is who! Que 4 – Do you want to follow the occupation of your parents? Why? Ans 4- Yes, because my father is an ideal for me. Que 5 – How do family members share their joys together? Explain with an example. Ans 5- The members of a family may live together or far away, but they all share their joys and sorrows with letters and mobiles. Ex- My grandfather is live at village but
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