# Chemistry

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

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1. 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

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2. so that website means that i need to use 1.6726 x 10^-27 kg

why that number

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3. 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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