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JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
Two stream of photons, possessing energies equal to twice and ten times the work function of metal are incident on the metal surface successively. The value of ratio of maximum velocities of the photoelectrons emitted in the two respective cases is \(x: y .\) The value of \(x\) is ...... .
- A \(0\)
- B \(2\)
- C \(1\)
- D \(4\)
Answer & Solution
Correct Answer
(C) \(1\)
Step-by-step Solution
Detailed explanation
\(KE _{\max }= hv -\phi\) \(\frac{1}{2} mv ^{2}= h v-\phi\) \(v =\sqrt{\frac{2( hv -\phi)}{ m }}\) \(\quad\) Given \(hv _{1}=2 \phi\) \(hv _{2}=10 \phi\) \(\therefore \frac{ v _{1}}{ v _{2}}=\sqrt{\frac{ hv _{1}-\phi}{ hv _{2}-\phi}}\)…
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