1.

A doubly ionized helium ion and a hydrogen ion are accelerated through the same potential. The ratio of the speeds of helium and hydrogen ions is (1) 1 : 2 (2) 2 :1 (3) 1 : √2 (4) √2 : 1

Answer»

Answer is (3) 1 : √2

E = (1/2)mν2 = qV

⇒ ν = √(2qV/m)

⇒ ν α √(q/m)

νHeH = √(2/1) x (1/4) = 1/√2 



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