Reason (R): According to classical physics all moving electrons radiate.
Solution:
Bohr's first postulate (A) states that electrons in stationary orbits do not radiate energy. This postulate was introduced to address the classical physics problem (R) where accelerating charged particles, like orbiting electrons, should continuously radiate energy.
Thus, both (A) and (R) are true, and (R) provides the underlying classical paradox that Bohr's postulate (A) resolved.
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