Asked by Lauren

What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for electromagnetic radiation of this wavelength.

For this one I did the same thing

6.63 X 10^-34/ (? kg)(6210 m/s) =

How do get the kg for the problem
Answered by DrBob222
There are many numbers quoted here and in different kinds of units. Be careful that you use the one with units of kg.
http://en.wikipedia.org/wiki/Proton
Answered by Lauren
so that website means that i need to use 1.6726 x 10^-27 kg

why that number
Answered by DrBob222
Because that's the mass of the proton in kilograms. Isn't that what you were looking for. The mass of the proton?
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