When a metallic surface is illuminated with radiation of wavelength λ the stopping potential is v. If the same surface is illuminated with radiation of wavelength 2λ the stopping potential is V4, The threshold wavelength for the metallic surface is
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a
52λ
b
3λ
c
4λ
d
5λ
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Detailed Solution
According to Einstein's photoelectric equation, eVs=hcλ-hcλ0∴ As per question, eV=hcλ-hcλ0……..(i)eV4=hc2λ-hcλ0……(ii)From equations (i) and (ii), we gethc2λ-hc4λ=hcλ0-hc4λ0⇒hc4λ=3hc4λ0 or λ0=3λ
When a metallic surface is illuminated with radiation of wavelength λ the stopping potential is v. If the same surface is illuminated with radiation of wavelength 2λ the stopping potential is V4, The threshold wavelength for the metallic surface is