Science, asked by rajvansh1652, 1 year ago

class 9 physics sound all formulas

Answers

Answered by singhalseema03p9uwqn
52
Velocity = Wavelenght × FrequencyVelocity = Frequency × WavelenghVelocity = (1/Time) × Wavelengh For Echo: 2 × Distance / Time = Speed of sound 
Answered by Anonymous
79

Formulas of sound :


(i) Echo


Speed of echo = ( 2 × distance between surface and source ) / time


(ii) V = f λ

  • where V = velocity of wave ,
  • f = frequency of sound wave ,
  • λ = wavelength .


(iii) f = 1 / t


  • where f = frequency of wave ,
  • t = time period .

(iv) E = h nu


  • where h = Plank's constant
  • E = energy of wave .

(v) f = √T/ 2 l ( π r² d )


  • f = frequency of stretched string
  • l = length
  • d = density
  • r = radius
  • T= time period .

Note that this formula is for stretched string only.

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