Question: Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the materials is : (a) 4 105 Hz (c) 1.6 x 105 Hz (b) 5 x 105 Hz (d) 2.5 x 10Hz

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