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JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter

\(\phi_{\mathrm{A}}=9 \mathrm{eV}\) एवं \(\phi_{\mathrm{B}}=4.5 \mathrm{eV}\) कार्यफलन वाले दो धात्विक तलों \(\mathrm{A}\) एवं \(\mathrm{B}\) के देहली तरंगदैर्ध्यो का अंतर \(\mathrm{nm}\) में है: (दिया है \(\mathrm{hc}=1242 \mathrm{eV} \mathrm{nm}\) )

  1. A \(264\)
  2. B \(138\)
  3. C \(276\)
  4. D \(540\)
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Answer & Solution

Correct Answer

(B) \(138\)

Step-by-step Solution

Detailed explanation

\(\lambda_{ A }=\left(\frac{1242}{9}\right)=138\,nm\) \(\lambda_{ B }=\left(\frac{1242}{4.5}\right)=276\,nm\) \(\lambda_{ B }-\lambda_{ A }=138\,nm\)
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