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← HistoryWhich outcome occurs in early mechanical escapements when iron components experience repeated thermal changes?
A)Pinion teeth deform plastically
B)Increased oxidation corrosion occurs
C)Rate of oscillation changes✓
D)Hairspring fatigue weakens quickly
💡 Explanation
The rate changes because thermal expansion/contraction alters length via dimensional changes; this modifies period as per the pendulum equation. The period changes rather than permanent deformation, because thermal stress cycles occur and are below yielding of the material.
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