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According to Planck's quantum theory, energy is emitted or absorbed in discrete packets called

Amolecules
Belectrons
Cphotons (quanta)
Dneutrons
Answer & Solution
Correct answer: C. photons (quanta)
Planck proposed $E = h\nu$. Each packet of radiation energy is a photon (or quantum), and energy exchange happens only in integer multiples of $h\nu$.
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