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Q. A horizontal ray of light falls on a vertical plane mirror free to turn about a horizontal axis. If the mirror turns through 20o, through what angle does the reflected ray turn?

Q. Suppose 120 moles of a monatomic ideal gas undergo an isothermal expansion from 1.00 {rm m^3} to 4.00 {rm m^3}, as shown in the figure . What is the temperature at the beginning of this process? What is the temperature at the end of this process? How much work is done by the gas during this expansion?

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