(II) It is not necessary that a heat engine's hot environment be hotter than ambient temperature. Liquid nitrogen is about as cheap as bottled water. What would be the efficiency of an engine that made use of heat transferred from air at room temperature to the liquid nitrogen "fuel" (Fig. ?
SolutionStep 1 of 6 a. What is the wavelength of a 2.0 MHz ultrasound wave traveling through aluminumGiven data The frequency of the ultrasound wave, f =2 MHzUsing 1 MHz=10 Hz6 f =2× 10 Hz ultrasound waves speed in aluminum is v =6420 m/sTo find,The wavelength of the ultrasound wave is, =