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the mass of an electron is 9.1 xx 10^(-3...

the mass of an electron is `9.1 xx 10^(-31) ` kg . If its K.E. is ` 3.0xx 10^(-25) J`. Calculate its wavelength .

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Kinetic energy `=1/2 mV^(2)=3.0xx10^(-25) J`
`V^(2)=3.0xx10^(-25) Jxx2/(9.1xx10^(-31)kg)`
`V^(2)=0.6593xx10^(6) m`
`V=0.8119xx10^(3) m`
`lambda=h/(mV)=(6.6xx10^(-34))/(9.1xx10^(-31)xx0.8119xx10^(3))`
`=0.812xx10^(-6)m`
`=8120xx10^(-10)m=8120 Å`
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