Question

Question #0fb46

Answer 1

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

Explanation:

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

`E=hf`

Planck's constant `=h`

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`