Question #0fb46

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Answer 1 · 2017-03-17T11:39:13

The energy is $=3.104*10^-19J$

The Planck-Einstein relation connects the energy $E$ with the frequency $f$

$E=hf$

Since, the speed, the frequency and the wavelength are related by the equation

$f=c/lambda$

therefore,

$E=hc/lambda$

$c=2.998*10^8ms^-1$

$lambda=6.4*10^-7m$

$h=6.626*10^-34Js$

Therefore,

$E=(6.626*10^-34*2.998*10^8)/(6.4*10^-7)$

$=(6.626*2.998/6.4)*10^-19$

$=3.104*10^-19J$