JEE Main 2022 · 25 Jun · Shift 1 · Physics Q46

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PhysicsSingle correct+4 / -1Question 46 of 90

The ratio for the speed of the electron in the 3 $^{\rm rd}$ orbit of $\mathrm{He^+}$ to the speed of the electron in the 3 $^{\rm rd}$ orbit of hydrogen atom will be :

1 : 1

1 : 2

4 : 1

2 : 1

Answer and worked solution

Official answer: D

Bohr speed $v=2.19\times10^6\dfrac Zn$ m s $^{-1}$ ; with the same $n$ , $v\propto Z$ : He $^+$ to H is $2:1$ .

(D)

Topics:Bohr model and hydrogen spectrum

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JEE Main 2022 · 25 Jun · Shift 1, Physics question 46