When a surface is irradiated with a light of wavelength \( 4950 \AA \) A a photocurrent appears ...
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0When a surface is irradiated
with a light of wavelength \( 4950 \AA \) A a photocurrent appears which vanishes if a retarding potential greater that \( 0.6 \mathrm{~V} \) is applied across the phototube. When a different source of light is used, it is found that the critical retarding potential is changed to \( 1.1 \mathrm{~V} \).
Wavelength of the second source is
(A) \( 4125 \AA \)
(B) \( 4950 \AA \)
(C) \( 2125 \AA \)
(D) \( 5124 \AA \)
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