Q. In the figure six lines of emission spectrum are shown. Which of them will be absent in the absorbtion spectrum.

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A

$1,2,3$

B

$1,4,6$

C

$4,5,6$

D

$1,2,3,4,5,6$

Solution:

The photon's with energies equal to that required for upward transition $A \rightarrow X , A \rightarrow B$ and $A \rightarrow C$ would be absorbed, hence only lines 1,2 and 3 will be present in absorption spectrum.

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