For years, marine scientist were mystified by sound waves detected by underwater microphones in the pacific ocean. these so-called t waves were among the purest sounds in nature. eventually the researchers traced the source to underwater volcanoes whose rising columns of bubbles resonated like organ pipes. a typical t wave has a frequency of 6.8 hz. knowing that the speed of sound in seawaver is 1,530 m/s, determine the wavelength of a t wave.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Iwill give brainliest if you answer right : )

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