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Q.

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 ?

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a

6.56 ×10-8 eV

b

2 ×10-8 eV

c

10-8 eV

d

8 ×10-8 eV

answer is A.

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Detailed Solution

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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