The kinetic energy of an electron in an atom such as hydrogen is typically around 10 eV.

Question:

The kinetic energy of an electron in an atom such as hydrogen is typically around 10 eV. 

(a) What is the wavelength of an electron with this energy? 

(b) How does this wavelength compare with the size of an atom? 

(c) If the energy were decreased by a factor of 10, how much would the wavelength change?

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