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What was the hardest chemistry regents? Calculate the wavelength (in nm) of the photon emitted when the hydrogen atom undergoes a transition from n = 5 to n = 3? A relay has a coil resistance of 100 Ω and its coil is rated at 0.2 A What is the voltage rating of this relay? What mass of NaOH must be dissolved in water to prepare 1.50 L of 0.500 M solution? Roughly how many cubic feet a refrigerator would have, if it is 58 inches high, 28 inches wide, and 30 inches deep. Just for an idea. Thanks?