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Radda [10]
2 years ago
6

A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student pre

pares a set of CoCl2(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
A wavelength of 510nm corresponds to an approximate frequency of 6×1014s−1. What is the approximate energy of one photon of this light?

9×1047J
3×1017J
5×10−7J
4×10−19J
Advanced Placement (AP)
1 answer:
Rina8888 [55]2 years ago
6 0

Answer:

E = 4 × 10⁻¹⁹ J

Explanation:

It is given that,

Wavelength = 510 nm

Frequency = 6\times 10^{14}\ Hz

We need to find the approximate energy of one photon of this light. The formula for the energy of a photon is given by :

E=hf\\\\=6.63\times 10^{-34}\times 6\times 10^{14}\\\\=3.97\times 10^{-19}\ J

or

E = 4 × 10⁻¹⁹ J

Hence, the correct option is (d).

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