The stopping potential of a photoelectric diode is 8 volts. e/m = 1.8 x 10" C kg ', then what is its velocity ? (a) 1.8 x 106 m/s (b) 1.8 х 105 m/s (c) 2.1 x 10 m/s (d) 1.8 x 104 m/s
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