(3 points) ultraviolet light with wavelength λ 300 nm falls on a cesium surface. the kinetic energy of emitted photoelectrons is 2.1 ev. what is the work function of cesium? what is the maximum wavelength of light for the photoelectric effect to occur for cesium?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)