A) \[\frac{\lambda }{2}\]
B) \[\lambda \]
C) \[2\lambda \]
D) \[4\lambda \]
Correct Answer: A
Solution :
de-Broglie wavelength \[\lambda \propto \frac{1}{\sqrt{T}}\] \[\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}\sqrt{\frac{{{T}_{1}}}{{{T}_{2}}}}\] \[\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}\sqrt{\frac{273+927}{273+27}}=\sqrt{\frac{1200}{300}}=2\] or \[{{\lambda }_{2}}=\frac{{{\lambda }_{1}}}{2}\]
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