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The meter has been defined as 1,650,763.73 wavelengths of the orange-red line of the emission spectrum of ^86Kr. Calculate the frequency of this radiation. In what proportion of the electromagnetic spectrum does the radiation fall?

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11 answers
  1. What is the wavelength of the Kr line? That is 1 m = 1,650,763.73 x wavelength. Solve for wavelength. Then

    c = freq*wavelength
    wavelength is from above.
    c = 3E8 m/s
    Solve for freq.
    Obviously if it is an orange-red line it must be in the visible part of the spectrum.
    By the way, I think you meant, "In what PORTION of .....".

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  2. I got 5.506x10^-3 when I divide the wavelength by the speed of light but I don't think that's right because Kr is an isotope. Could you please explain how this works too?

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  3. Not what I get. What is the wavelength you have. Post your work and I'll find the error.

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  4. Oh is it 1.816x10^2? I divide the speed of light by the wavelength: 2.998x10^8 / 1,650,763.73
    I did the reverse the first time. Is this correct now?

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  5. No. 1,650,763.73 is not the wavelength. Look at my first response again.
    1 m = 1,650,763.73 x wavelength and you calculate the wavelength from that. Frequency is in the order of 10^14 Hz unless I punched te wrong buttons.

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  6. ok so for wavelength I get 6.058x10^-7
    then I divide: 2.998x10^8 / 6.058x10^-7 and get 4.949x10^14 Hz
    Is this correct?

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  7. Looks ok to me.

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  8. Thank you for your help

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  9. I didn't think to post the earlier but since you have so many significant figures in the wavelength calculation, you could use that many places in the speed of light. I don't know that many places but I know it's available on the web.

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  10. I do not even know how I stopped up here, however I assumed this put up was good. I do not recognise who you are however definitely you're going to a wellknown blogger for those who are not already bfdedacekdbd

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  11. how did you get 6.058x10^-7?

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