The cathode of a photoelectric cell is ...

The cathode of a photoelectric cell is hanged,such that the work function chagnes from `omega_1` to `omega_2(omega_2>omega_1)`.If the currents before nad after the change are `I_1` and `I_2`,all other conditions unchanged,then (assuming `h v > omega _2)`,

`I_1=I_2`

`I_1ltI_2`

`I_1gtI_2`

`I_1ltI_2lt2I_1`.

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