Question

an electron of stationary hydrogen atom passes from 5th energy level to ground level.the velocity that atom required wil be?

Answer 1

≡QUESTION≡

An electron of stationary hydrogen atom passes from 5th energy level to ground level. The velocity that atom required will be?

║⊕ANSWER⊕║

For emission, the wave no. of the radiation is given as

1/λ = Rz² (1/n₁² – 1/n₂²)

R = Rydberg constant

Z = atomic number

= R (1/1² – 1/5²)

= R (1 – 1/25)

⇒ 1/λ = R 24/25

P = h/λ

  = h x R x 24/25 (De-Broglie hypothesis)

⇒ mv = 24hR / 25

⇒ V = 24hR / 25m