Exam-style question
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What is the energy of a photon with a frequency of 5 x 10^14 Hz?.
- A.3.3 x 10^-19 J
- B.2.5 x 10^-19 J
- C.1.2 x 10^-19 J
- D.6.6 x 10^-19 J
Model answer
What a good answer should say
- 3.3 x 10^-19 J
Explanation
Why this works
The energy of a photon can be calculated using the formula E = hf, where h is Planck's constant (6.63 x 10^-34 J·s) and f is the frequency. Substituting the values: E = (6.63 x 10^-34 J·s)(5 x 10^14 Hz) = 3.315 x 10^-19 J, which rounds to 3.3 x 10^-19 J.
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