WebSound of Class 9. I magination of world without sound would be a mixed feeling of horror and fun. Every day we hear sounds from various sources like humans, birds, bells, machines, vehicles, televisions, radios, etc. The study of sound is largely based on the classical contribution of Helmlroltz and Lord Reyleigh. However, the significance of ... WebA sonar apparatus consists of two parts : (i) A transmitter (for emitting ultrasonic waves) and (ii) a receiver (for detecting ultrasonic waves). Now suppose a sonar device is attached to the under-side of a ship and we wan to measure the depth of sea (blow the ship). To do this, the transmitter of sonar is made to emit a pulse of ultrasonic ...
Sound notes for CBSE class 9 Physics - TopperLearning
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NCERT Solutions for Class 9 Science Chapter 12 Sound - Study …
Web2 days ago · Free PDF download of Class 9 Revision Notes, short key-notes to score more marks in exams, prepared by expert teachers from the latest edition of CBSE books. … Web9. Relation between speed of sound, time of hearing echo and distance of reflection body : If t is the time at which an echo is heard, d is the distance between the source of sound … Web7 rows · Category. Class 9 Science Notes. Medium. English. Class 9 Science Chapter 12 Sound Notes. ... introducing legislation meaning