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h = 6,6×10⁻³⁴ J/s
λ = 2,5×10⁻⁷ m
E = h . c / λ
E = 6,6×10⁻³⁴ . 3×10⁸ / 2,5×10⁻⁷
E = 19,8×10⁻²⁶ / 2,5×10⁻⁷
E = 7,92×10⁻¹⁹ J
syarat notasi ilmiah itu :
a,.....×10ⁿ
dimana :
a = bilangan asli antara 1 - 9
n = eksponen bilangan bulat
karena a nya harus bilangan asli, artinya ≠ 0, maka jawabannya yang B