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Chemistry help! Debroglie equation!?
Calculate the wavelength of a person traveling at 3.65*10^4 m/s. The mass of the person is 85 kg.
Someone help i know the equation is wavelength=h/mv but i dont understand the process
1 Answer
- Robert DLv 78 years agoFavorite Answer
Katie, you have to pay attention to the units in the problem.
wavelength = λ = h/mv All of your data is in the correct form for you to make a direct calculation.
h = Planck's constant = 6.626 x 10^-34 J*s Remember that 1 J = 1 kg*m^2/s^2; m = mass of person = 85 kg; v = speed of person in m/s = 3.65 x 10^4 m/s. The wavelength, λ, will be in meters.
Now, just put the numbers into your calculator and chug out an answer. Better yet, put the equation and numbers on a sheet of paper and work it out long hand. You learn better this way.
λ = (6.626 x 10^-34 J*s)/(85 kg)(3.65 x 10^4 m/s)
λ = (6.626 x 10^-34 kg*m^2*s/s^2)/(85 kg)(3.65 x 10^4 m/s) Now cancel out the units and you should end up with only meters left over.
Hope this is helpful to you. JIL HIR
