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NEET 1988 (AIPMT) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 1988 (AIPMT)

Q175NEET 1988 · AIPMTEasy

Photoelectric Effect: Einstein's Equation

The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 Å. Its work function is

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Answer: (a)

  1. ϕ=hcλ0=6.63×10−34×3×1085000×10−10\phi = \dfrac{hc}{\lambda_0} = \dfrac{6.63\times10^{-34}\times3\times10^{8}}{5000\times10^{-10}}
  2. ϕ≈3.98×10−19 J≈4×10−19 J\phi \approx 3.98\times10^{-19}\text{ J} \approx 4\times10^{-19}\text{ J}
  3. So the answer is (a) 4×10−19 J4\times10^{-19}\text{ J}.
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