Figure shows the stopping potential (V)versus frequency (v) graph for photoelectric effect in a metal. From the graph, The Planck's constant (h) is . The value of y is
………..(1)
From Eq. (1) it follows that the slope of the graph is . Therefore
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When a metallic surface is illuminated with radiation of wavelength , the stopping potential is V. If the same surface is illuminated with radiation of wavelength
2, the stopping potential is . The threshold wavelength for the metallic surface is
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