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Q1. A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency?

Q2. Medical ultrasound has a frequency of 4.75 × 10^7 Hz. What is the wavelength, in mm, of the sound during water, in which the speed of sound is 1495 m/s?

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