1.

De-Broglie wavelength associated with the hydrogen atom moving with most probable velocity at \[27{}^\circ C\] is \[1.26\overset{\text{o}}{\mathop{\text{A}}}\,\]. De-Broglie wavelength associated with helium atom moving with r.m.s. velocity at \[51{}^\circ C\] is:

A. \[2.268\overset{\text{o}}{\mathop{\text{A}}}\,\]
B. \[1.852\overset{\text{o}}{\mathop{\text{A}}}\,\]
C. \[0.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
D. \[0.7\overset{\text{o}}{\mathop{\text{A}}}\,\]
Answer» D. \[0.7\overset{\text{o}}{\mathop{\text{A}}}\,\]


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