MCQ
According to Planck’s quantum theory any electromagnetic radiation is:
- AContinuously emitted.
- BContinuously absorbed.
- ✓Emitted or absorbed in discrete units.
- DNone of these.
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[Given: The permeability of free space $\mu_0=4 \pi \times 10^{-7} \mathrm{NA}^{-2}$ ]