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  • What is the (b) speed of an electron with kinetic energy of 120 eV.

Q: 11.13 (b) What is the speed of an electron with kinetic energy of 120\hspace{1mm}eV. 

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The relation between speed and kinetic energy of a particle is

\\v=\sqrt{\frac{2K}{m}}\\ v=\sqrt{\frac{2\times 120\times 1.6\times 10^{-19}}{9.1\times 10^{-31}}}\\ v=6.495\times 10^{6}\ m\ s^{-1}

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