A photon has an energy of 3.0 eV. What is its wavelength (h = 6.63 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m/s, e = 1.6 × 10⁻¹⁹ C)?
Correct answer D. 414 nm
Explanation
E = 3.0 × 1.6 × 10⁻¹⁹ = 4.8 × 10⁻¹⁹ J. λ = hc/E = 1.989 × 10⁻²⁵/4.8 × 10⁻¹⁹ = 4.14 × 10⁻⁷ m = 414 nm.
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