Final answer:
The energy of a photon can be calculated using the formula E = hf, where E is the photon's energy, h is Planck's constant, and f is the frequency. However, the provided frequency lacks a complete exponent, which is needed to give a specific answer.
Step-by-step explanation:
To calculate the energy in joules of a photon with a given frequency, we use the equation E = hf, where E is the energy in joules, h is Planck's constant (6.626 × 10⁻³⁴ J·s), and f is the frequency of the photon in hertz (Hz). However, your provided frequency of 6.89 × 10 seems to be missing an exponent for the power of 10. Assuming we are to find the energy of a photon with a complete frequency value, we would insert the correct frequency into our equation to find the energy of the photon. For instance, using a frequency of 5.5 × 10¹⁴ Hz from the referenced material as an example, the energy would be: E = (6.626 × 10⁻³⁴ J·s)(5.5 × 10¹⁴ Hz) = 3.6 × 10⁻¹⁹ J.