A photon of wavelength 900 nm behaves like a particle of what mass?
Correct answer D. 2.46 × 10⁻³⁶ kg
Explanation
The photon's equivalent mass is m = h/(λc) = 6.63 × 10⁻³⁴ ÷ (900 × 10⁻⁹ × 3 × 10⁸) ≈ 2.46 × 10⁻³⁶ kg.
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