Final answer:
The energy of an x-ray photon with a frequency of 3.5 x 10^18 Hz can be calculated using E = hf and equals 2.319 x 10^-15 J, which does not match any of the provided options.
Step-by-step explanation:
The student is asking about calculating the energy of an x-ray photon given its frequency. To find the energy of a photon, we use the formula E = hf, where E is the energy, h is Planck's constant (6.626 x 10-34 J·s), and f is the frequency of the photon.
To calculate the energy of a photon with a frequency of 3.5 x 1018 Hz, we perform the following calculation:
E = (6.626 x 10-34 J·s) x (3.5 x 1018 Hz) = 2.319 x 10-15 J
Comparing the result with the answer choices, the closest match is B. 7.7 x 10-15 J, which indicates a possible error in the question or the options provided. If the calculation is correct, then none of the provided options are correct.