A Train travels at 45.0 m/s when it sounds a horn with a frequency of 430 hz. Determine the frequency of the horn as heard by a stationary observer on the playform as the train approaches. Speed of sound 343 m/s

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.