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Answer:
6×10^-7m
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ⒽⓁⓄ ⓜⓐⓣⓔ
bita = lemda D / d
∆bita = lemda ∆ D / d
I.e, lemda = ∆ bita × d / ∆D
lemda = (10^-3) (0.03×10^-3) /5×10^-2
= 5000A°
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