Which of the following transitions are allowe | vedclass

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(B) In an electronic emission spectrum,the selection rule for allowed transitions is $\Delta l = \pm 1$. For option $A$: $2s \rightarrow 1s$,$\Delta l

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$2p \rightarrow 1s$

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(B) In an electronic emission spectrum,the selection rule for allowed transitions is $\Delta l = \pm 1$. For option $A$: $2s \rightarrow 1s$,$\Delta l = 0 - 0 = 0$. This is a forbidden transition. For option $B$: $2p \rightarrow 1s$,$\Delta l = 0 - 1 = -1$. This is an allowed transition. For option $C$: $3d \rightarrow 2p$,$\Delta l = 1 - 2 = -1$. This is an allowed transition. Since both $B$ and $C$ are allowed,and the question asks for allowed transitions,there is a discrepancy in the provided options. However,in standard atomic physics,transitions following $\Delta l = \pm 1$ are allowed. Given the options,$B$ and $C$ are both valid. If this is a single-choice question,it may be flawed,but $2p \rightarrow 1s$ is the most fundamental allowed transition.

Which of the following transitions are allowed in the normal electronic emission spectrum of an atom?

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