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3.a) Consider two speakers along the y axis a distance 2 wavelengths apart emitting 680 Hz frequency in phase. Calculate where along the x axis will one find intensity minima.

b) The sun produces its power from the conversion of mass into energy by Einstein's equation E=mc2 where c=3x10^8 mls. the sun's intensity on the earth is 1346W/m^2 and the distance to the sum is about 1.5x10^11m. Calculate the rate at which mass is being converted to energy in the sun.

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