Question

Using the Formula for the Energy of a Photon
A 2 column table with 4 rows. The first column is labeled light with entries violet, green, yellow, red. The second column is labeled frequency in hertz with entries 7.59 times 10 Superscript 14 baseline, 5.10 times 10 Superscript 14 baseline, 5.01 times 10 Superscript 14 baseline, 4.72 times 10 Superscript 14 baseline.
The energy of a photon was found to be
3.38 × 10–19 J. Planck’s constant is 6.63 × 10–34 J • s.

Which color of light corresponds to this photon?

violet
green
yellow
red

Answer 1

Use E = hf so f = E/h = (3.38×10^−19 J) / (6.63×10^−34 J·s) ≈ 5.10×10^14 Hz.
That matches the green light entry. Answer: green.