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Illustration 3.29 When a surface is irradiated with light ofwavelength 4950 A, a photocurrent appears which vanishesif a retarding potential greater than 0.6 V is applied acrossthe photo tube. When a different source of light is used, it isfound that the critical retarding potential is changed to 1.1V. Find the work function of the emitting surface and thewavelength of the second source. |
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