A light of wavelength λ 1 is incident on a photoelectric plate. It is found that for…
Chemistry · NEET · NTA Exams — Structure of Atom
A light of wavelength λ1 is incident on a photoelectric plate. It is found that for certain potential difference the number of photoelectrons reaching the collector plate is zero. When light of wavelength λ2 is used, the number of photoelectrons reaching the collector plate is zero at twice the above value of potential difference. The threshold wavelength for the photoelectric surface is
- \(\frac{\lambda_{1} \lambda_{2}}{\lambda_{2}-Z \lambda_{1}}\)
- \(\frac{Z \lambda_{1} \lambda_{2}}{\lambda_{2}-Z \lambda_{1}}\)
- \(\frac{\lambda_{1} \lambda_{2}}{\lambda_{2}-\lambda_{1}}\)
- \(\frac{\lambda_{1} \lambda_{2}}{2 \lambda_{2}-\lambda_{1}}\)
Answer
(D) _ 1 _ 2 2 _ 2 - _ 1
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