What is the energy of a photon with a frequency of 1 point 7 times 10 to the 17th power Hz ? Planck’s constant is 6 point 6 3 times 10 to the negative 34 power times cap j times s

Use the photon energy formula E = hf, where h is Planck’s constant and f is the frequency. Substituting gives E = (6.63 × 10⁻³⁴ J·s)(1.7 × 10¹⁷ Hz) = 1.13 × 10⁻¹⁶ J, since Hz is s⁻¹. Rounded to two significant figures, the energy is 1.1 × 10⁻¹⁶ J, choice A.

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