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Aphoton of energy 4.5 eV strikes on a me...

Aphoton of energy `4.5` eV strikes on a metal surface of work function `3.0 eV.` If uncertainty in position is `(25)/(4pi)Å,` find the uncertainty in measurment of deBroglie wavelength (inÅ ).

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The correct Answer is:
4
`KE = 1.5 eV`
`lambda = (h)/(sqrt(2m(KE))) = 10^(-9)m`
or `lambda = sqrt((150)/('Voltage")) A^(@) rArr lambda = 10 A^(@)`
`Delta x.(h)/(lambda^(2)).Delta lambda = (h)/(4pi)`
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