Sound : CBSE Class 9 IX Science (Physics) In This Presentation include Revision Notes of Class 9 Science Sound. In class 9th CBSE Science syllabus one of the interesting topic is 'Sound' which is related to our real life.It includes Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR.Structure of the human ear (auditory aspect only). Here is a demo of online video lecture. You can watch this complete video at http://www.dronstudy.com Alternatively, visit this URL to access this chapter directly http://dronstudy.com/video/sound-lec-1 ..... Here is the list of important URLs related to dronstudy.com Youtube Video Link: http://www.youtube.com/edit?o=U&video_id=Tfcv33RtVtQ Youtube Channel Link: http://www.youtube.com/channel/UCPiuJvuyMVFSwcIdBCTpTyQ Website Link: http://www.dronstudy.com Website Page: http://dronstudy.com/video/sound-lec-1 Facebook Page:https://www.facebook.com/pages/Dronstudycom/582085731844505?ref=hl

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