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Explanation:
Given:
λ = wavelength = 616 nm
frequency of an electro magnetic radiation
f = c / λ
f = 2.98 * 10⁸ / 616 * 10⁻⁹
= 4.837 * 10¹⁴ Hz
energy in one photon or quantum
E = h f
= 6.626 * 10⁻³⁴ * 4.837 * 10¹⁴
= 3.205 * 10⁻¹⁹ J
= 2 eV
number of quanta = energy/energy per quantum
= 2 J / 3.205 * 10⁻¹⁹
= 6.239 * 10¹⁸ number of photons or quanta
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