Problem 35P

A uniform narrow tube 1.80 m long is open at both ends. It resonates at two successive harmonics of frequencies 275 Hz and 330 Hz. What is (a) the fundamental frequency, and (b) the speed of sound in the gas in the tube?

Solution 35PIntroductionAt first we have to calculate the perspiration rate at kg/s, then, from the latent heat, we cancalculate the rate of energy removal.SolutionStep 1At first let us convert the perspiration rate from L/h to kg/s.The density of water is = 1 L/kg1 hour is = 3600 sSo the perspiration rate is = 3.5 L/h = = 9.72 × 10 4 kg/sSo in 1 second body is vaporizing 9.72 × 10 4 kg of water, using latent heat we willcalculate the required energy to vaporise this amount of water.