Exam-style question
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What is the energy in joules of a photon with a frequency of 5 x 10^14 Hz?.
- A.3.2 x 10^-19 J
- B.1.0 x 10^-19 J
- C.2.0 x 10^-19 J
- D.4.0 x 10^-19 J
Model answer
What a good answer should say
- 3.2 x 10^-19 J
Explanation
Why this works
The energy (E) of a photon can be calculated using the formula E = hf, where h is Planck's constant (6.63 x 10^-34 J·s). Substituting the values gives E = (6.63 x 10^-34 J·s) x (5 x 10^14 Hz) = 3.315 x 10^-19 J, which rounds to approximately 3.2 x 10^-19 J.
Therefore, the energy of the photon is 3.2 x 10^-19 J.
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