SELECT * FROM question_mgmt as q WHERE id=4240 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=192 and ex_no='11' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Sound describe with the help of a diagram how compressi

Question:

Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

Answer:

Compressions and rarefactions are produced because the disturbance in the medium is caused by sound waves. When an object vibrates then it moves forward, it pushes and compresses the air in front of it creating a region of high pressure in its vicinity. This region of high pressure is known as compressions. When it moves backward, it creates a region of low pressure in its vicinity. This region is known as a rarefaction.


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