Practice question
Question
A photon has an energy of 4.968 × 10⁻¹⁹ J. What is its wavelength in nanometers? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)
Explanation
λ = hc/E = 400 nm.
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