Astereo speaker produces a pure \"e\" tone, with a frequency of 329.6 hz. what is the period of the sound wave produced by the speaker? what is the wavelength of this sound wave as it travels through air with a speed of about 341 m/s? what is the wavelength of the same sound wave as it enters some water, where it has a speed of about 1480 m/s?

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)