That would be a depression..
Answer is: the energy of exactly one photon of this light is 4.75·10⁻¹⁹ J.
Photon energy equation: E = h·ν.
E - energy of one photon.
ν- frequency.
h - Planck's constant.
ν = 7.17·10¹⁴ Hz.
h = 6.63·10⁻³⁴ J·s.
E = 6.63·10⁻³⁴ J·s · 7.17·10¹⁴ Hz.
E = 4.75·10⁻¹⁹ J.
The correct answer is <u>C: 0.510 m</u>
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N I C E - D A Y!
2Fe2O3, reason is when we add 4Fe + 3O2, we get the same answer, but in a different form.
b............................................