JEE Main202225 Jun 2022Morning ShiftPhysicsAtomic PhysicsActual

The ratio for the speed of the electron in the 3 rd orbit of He + to the speed of the electron in the 3 rd orbit of hydrogen atom will be :

Options

A1 : 1
B1 : 2
C4 : 1
D2 : 1

Correct answer

D. 2 : 1

Step-by-step solution

The speed of electron is given by v = 2 . 18 × 10 6 × Z n   m   s - 1 , where, Z is atomic number and n is number of orbit. Now, for third orbit, ratio of speed of electron is v H v He + = Z H Z He + = 1 2 ⇒ v He + v H = 2 1

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