Ionized hydrogen atoms and ∝ -particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths r H : r will be :

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A 4 : 1 
B 1 : 4   
C 2 : 1  
D 1 : 2


Solution

r = =
r ∝
= =
r H : r = 2 : 1

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