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Doubly ionised helium atoms and hydrogen ions are accelerated from rest through the same potential drop. The ratio of the final velocities of the helium and the hydrogen ion is(a) 1/2(b) 2(c)1/sqrt2(d) sqrt2

Amit Saxena , 11 Years ago
Grade upto college level
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Amit Saxena

Last Activity: 11 Years ago

 (d)

 mv2 = eV, or, V = (2eV/m)1/2

the mass of helium ion is four times that of hydrogen ion.

Further, the charge on helium ion is twice that of hydrogen ion.

    vHe/vH =   sqrt 2

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