What is the wavelength of a blue light with a frequency of 6.4 x 1014 s-1?

What is the wavelength of a blue light with a frequency of 6.4 x 1014 s-1?
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1- Who was able to explain the photoelectric effect?

2- What is nfinal in the Paschen series?

3- How many f orbitals exist per energy level?

4- What kind of electron will be lost upon the first ionization of Molybdenum?

5- How many 3d electrons does a Cr6+ ion have?

6- Which of the following has the highest first ionization energy? Br, S, Cl, K.

7- Which of the following substances is diamagnetic in its ground state? O, Ne, N, F.

8- What is the wavelength of a blue light with a frequency of 6.4 x 1014 s-1?

9- A blue-green photon has a wavelength of 486 nm. What is its energy in joules?

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