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alright, with the given values you have, plug the numbers into this equation:

frequency = speed/ wavelength

in this case

speed is the speed of light 'c' which is 3.0 x 10 ^8 m/s

so wavelength = c/f

= 300 000 000 (m/s)/ 7.421014Hz

= 40425742.36 m

= 4.0 x 10^7 m

there you go

---

gh

For your information, purple is not a real colour. It is a combination of red and blue.

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Q: What is the wavelength of a purple light that has a frequency of 7.421014?
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