CUET · PHYSICS · PYQ PAPER 2023
If electron, deutron, \(\alpha\)-particle and proton have same kinetic energy, which one has the largest deBroglie wavelength.
- A proton
- B deutron
- C electron
- D \(\alpha\)-particle
Answer & Solution
Correct Answer
(C) electron
Step-by-step Solution
Detailed explanation
\(\lambda = \frac{h}{\sqrt{2mK}}\) Since \(K\) is same for all particles, \(\lambda \propto \frac{1}{\sqrt{m}}\). \(m_{electron} < m_{proton} < m_{deutron} < m_{\alpha-particle}\) Smallest mass (\(m_{electron}\)) gives largest \(\lambda\). electron
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