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Questions  

A sodium atom is in one of the states labelled .Lowest excited levels'. It remains in that.state for an average time of 10-8 sec, before it makes a transition back to a ground state. What is the uncertainty in energy of that excited state ?

a
6.56 ×10-8 eV
b
2 ×10-8 eV
c
10-8 eV
d
8 ×10-8 eV

detailed solution

Correct option is A

The average time that the atom spends in this excitedstate is equal to Δt so by using ΔE.Δt=h2π⇒Uncertainty in energy=h/2πΔt

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