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Physics-

General

Easy

Question

$pi$ mesons can be

$π^{+}$ or $π^{-}$
$π^{+}$ or $π^{0}$
$π^{-}$ or $π^{0}$
$π^{+}, π^{-}$ or $π^{0}$

The correct answer is: $pi to the power of plus end exponent comma pi to the power of minus end exponent$ or $pi to the power of 0 end exponent$

$p rightwards arrow pi to the power of plus end exponent plus n comma$ $n rightwards arrow p plus pi to the power of minus end exponent$ and $n rightwards arrow n to the power of ´ end exponent plus pi to the power of 0 end exponent$

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The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level B to A). The following spectral lines will also occur in the absorption spectrum

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