Question

Which sound wave has more energy in relation to frequency and explain why: high or low frequency sounds? Which sound wave dissipates quicker in air and please explain why: high frequency or low frequency? Name an example of where the dissipation rate for a sound wave is important to consider?

Answer 1

(a) a sound wave travels by disturbing the medium by creating vibration. one particle vibrates and transfer its energy to other particle and it will depend upon the frequency of vibration. so, the energy of any wave is depend upon its frequency.

energy is directly proportional to the frequency

so, higher the frequency , higher will be the energy

(b) the attenuation of sound wave depends upon the viscosity of the medium. the viscous force depend upon the rate of change of velocity of medium with the position .the frequency of the wave is inversely proportional to the wavelength

where v = velocity

f = frequency

λ = wavelegth

as the wave travels the higher frequency wave will dissipate faster because of the attenuation depends upon the velocity.

(c) radio frequency waves