Calculate the wavelength of the light emitted when an electron in a one-dimensional box of length 5.2nm makes a transition from the n = 7 state to the n = 6 state.(adsbygoogle = window.adsbygoogle || []).push({});

Express your answer with the appropriate units.

I calculated in this way:

E = n^2*h^2/8*m*a^2

E= (7^2-6^2)*(6.626*10^-34)^2/8*(9.1*10^-31)*(5.2*10^-9)^2

E= 2.9*10^-20 J

E = hc/λ

λ = 6.85*10^-6 m

But the answer is wrong.

What is wrong with my calculation?

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# What is the wavelength of the light？

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