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Q. Suppose that a hypothetical atom gives a red, green, blue and violet line spectrum. Which jump according to figure would give off the red spectral line
image

Structure of Atom

Solution:

According to energy, $ E_{4\to1} >E_{3\to1}>E_{2\to1}>E_{3\to2} $ According to energy, Violet > Blue > Green > Red.
$\therefore $ Red line $\Rightarrow \,\,\,\,3 \to2$ transition.