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# Which of the given colors do not show photoelectric effect from this experiment?

$\begin {array} {1 1} (a)\;Blue & \quad (b)\;Green \\ (c)\;Orange & \quad (d)\;Violet \end {array}$

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A)
Ans : (c)
Photoelectric effect in this experiment will not be possible if the energy
of incident photon is less than that of yellow light, which is so
for orange ligth.