ICSE Class 9: Production and Propagation of Sound Waves Videos | Propagation of Sound Waves

• what is sound wave?
• what is a sound wave
• 1. Why are sound waves called mechanical waves?    
• A source of wave produce 40 created 20 throughs in 0.45 seconds what is the frequency of the wave??
  
• what is rare fraction?
• propagation of disturbance in air  metal strip example
• i am not able to do numericals
• A source of wave produces 40 crests and 40 troughs in 0.4 s.What is the frequency of the wave?
• The heart of a man beats 75 times a minute .What is it's (a) frequency and (b) time period?
• The time period of a simple pendulum is 2s.Find it's frequency.

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