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anonymous

  • one year ago

Calculate the de Brolie wavelength (in nm) of a hydrogen atom (m=1.674 x 10^-27 kg) moving at 1430 cm/s.

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  1. anonymous
    • one year ago
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    do you know de brogile's formula?

  2. anonymous
    • one year ago
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    Not really

  3. anonymous
    • one year ago
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    \(\sf p=h/ \lambda\)? p=momentum, h=planck's constant, lambda=wavelength.. rearrange the formula to solve for the wavelength: \(\sf \lambda =h/p \) you know that momentum is equal to mass times velocity so sub p=mv to the equation.. it will be \(\sf \lambda =h/mv \) Sub in your given values, just be careful about the units though :)

  4. anonymous
    • one year ago
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    do you know the value for Planck's constant?

  5. anonymous
    • one year ago
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    yes. 6.626 x 10^-34

  6. anonymous
    • one year ago
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    don't forget the unit, it is very important

  7. anonymous
    • one year ago
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    (6.626x10^34 kg m^2/s^2 s)/(1.674x10^-27kg)(14.3m)

  8. anonymous
    • one year ago
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    **it should be 6.626x10^34 kg m^2/s and 14.3 m/s kg, m, and s will get cancelled out, so your answer would be in metres, what will you get when you calculated that?

  9. anonymous
    • one year ago
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    1586145132 m

  10. anonymous
    • one year ago
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    i got a different answer..

  11. anonymous
    • one year ago
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    try recalculating it again.. |dw:1443058593861:dw|

  12. anonymous
    • one year ago
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    I got that answer when I did it again to double check.

  13. anonymous
    • one year ago
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    Got 2.767983959x10^-8

  14. anonymous
    • one year ago
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    Is that what you got?

  15. anonymous
    • one year ago
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    okay, i think we got the same answer now. Last thing you have to do is to convert that to nm

  16. anonymous
    • one year ago
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    I multiple by 1.0 x 10^-9 right?

  17. anonymous
    • one year ago
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    yeah.. but i think it should be 1x10^9 nm because you're going from m to nm If you are converting from nm to m, then it will be x10^-9

  18. anonymous
    • one year ago
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    I got 27..67983959

  19. anonymous
    • one year ago
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    *27.6798359

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