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Mass of object (wave nature of matter)

  1. Feb 7, 2013 #1
    1. The problem statement, all variables and given/known data

    An object has a wavelength of 8.4*10^-14 m
    and a speed of 1.2*10^6 m/s.
    Find the mass.

    2. Relevant equations

    p=h/λ


    3. The attempt at a solution

    p=h/λ
    mv=h/λ
    m=h/λv

    m=(6.63*10^-34)/((1.2*10^5)(8.4*10^-14))
    m=6.577380952*10^-26 kg

    Is this correct? (other than significant digits)
     
    Last edited: Feb 7, 2013
  2. jcsd
  3. Feb 7, 2013 #2

    jedishrfu

    Staff: Mentor

    the arithmetic works out correctly but your m=(6.63*10^-34) / ( (1.2*10^5) * (8.4*10^-14) ) equation
    needs some parens in the denominator.

    You must adjust m for significant figures to be m=6.58 E -26 kg

    Also your logic looks right too, but being out of physics for a long time I'd wait for someone to second my opinion.
     
    Last edited: Feb 7, 2013
  4. Feb 7, 2013 #3
    fixed. as i mentioned in the op i haven't yet adjusted for sig dig
     
  5. Feb 8, 2013 #4

    jedishrfu

    Staff: Mentor

    okay didnt see it. tunnel vision sometimes.
     
  6. Feb 8, 2013 #5
    thats cool thanks for checking anyway
     
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