Light of wavelength 663 nm has photons of energy 3.0 × 10⁻¹⁹ J. About how many such photons carry a total energy of 1.0 J?
Correct answer D. 3.3 × 10¹⁸
Explanation
The number of photons equals total energy divided by energy per photon: 1.0 ÷ 3.0 × 10⁻¹⁹ = 3.3 × 10¹⁸ photons.
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