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A pipe in air at 19 *C is to be designed to produce two successive harmonics at 245 Hz and 280 Hz . The speed of sound in air is v ~ (331 + 0.607) m/s, where T is the temperature in * C.Part A How long must the pipe be? Express your answer to two significant figures and include the appropriate units. HA ? L = Value UnitsA piano tuner hears one beat every 1.5 s when trying to adjust two strings, one of which is sounding 350 Hz.How far off in frequency is the other string? Express your answer to two significant figures and include the appropriate units. HA Af = Value UnitsTwo automobiles are equipped with the same singlefrequency hom. When one is at rest and the other is moving toward the first at 17 m/s , the driver at rest hears a beat frequency of 5.0 Hz .What is the frequency the horns emit? Assume T = 20' C. Express your answer to two significant figures and include the appropriate units. HA Value Units