A yellow laser provides 210 kJ/mol of energy to excite electrons in a sample. What is the frequency of this light?

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A yellow laser provides 210 kJ/mol of energy to excite electrons in a sample. What is the frequency of this light?

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Maris 3 years 2021-09-03T03:41:33+00:00 1 Answers 26 views 0

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  1. Dulcie
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    2021-09-03T03:43:23+00:00
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    Answer:

    Frequency, f=5.24\times 10^{14}\ Hz

    Explanation:

    It is given that, a yellow laser provides 210 kJ/mol of energy to excite electrons in a sample. We need to find the frequency of this light.

    Energy, E = 210 kJ/mol

    i.e.

    E=210\ \dfrac{kJ}{mol}\\\\E=210\times 1000\ \dfrac{J}{mol}\\\\E=\dfrac{21\times 10^4\ J/mol}{6.022\times 10^{23}\ /mol}\\\\E=3.48\times 10^{-19}\ J

    The energy used to excite electrons is given by :

    E=hf\\\\f=\dfrac{E}{h}\\\\f=\dfrac{3.48\times 10^{-19}}{6.63\times 10^{-34}}\\\\f=5.24\times 10^{14}\ Hz

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