If the de-Broglie wavelengths for a proton and for a \[\alpha -\]parti – McqOptions

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1.	If the de-Broglie wavelengths for a proton and for a \[\alpha -\]particle are equal, then the ratio of their velocities will be [NCERT 1972]
A.	4 : 1
B.	2 : 1
C.	1 : 2
D.	1 : 4
Answer» B. 2 : 1

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