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If the energy of a photon is given as 3.03 × 10⁻¹⁹ J then, the wavelength (λ) of the photon is:

1. 6.56 nm
2. 65.6 nm
3. 656 nm
4. 0.656 nm

Correct answer: 656 nm

Solution

The energy of a photon is related to its wavelength by the equation E = hc/λ. Substituting h = 6.626 × 10⁻³⁴ J·s, c = 3 × 10⁸ m/s, and E = 3.03 × 10⁻¹⁹ J, we calculate λ = 656 nm.

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