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NEET 2008 (AIPMT) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2008 (AIPMT)

Q160NEET 2008 · AIPMTMedium

Photoelectric Effect: Einstein's Equation

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

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Answer: (c)

  1. E=ϕ+eV0=6.2+5=11.2E = \phi + eV_0 = 6.2 + 5 = 11.2 eV
  2. λ=124011.2\lambda = \frac{1240}{11.2} nm ≈111\approx 111 nm
  3. This is below 400 nm and above the X-ray range, i.e. ultraviolet.
  4. So the answer is (c) Ultraviolet region.
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