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• Gelombang Elektromagnetik
c = 3×10^8 m/s
λ = ___?
f = 2,1 GHz = 2,1×10^9 Hz
c = λ f
→ λ = c / f
→ λ = 3×10^8 / 2,1×10^9
→ λ = 1/7 m ← jwb