Question

Question #02ccf

Answer 1

Have a look (and check my maths anyway).

Explanation:

Here you can use Einstein's relationship:
`E=h*f`
Where:
`h=6.63xx10^(-34)Js` is Planck's constant;
`f` is frequency that you can evaluate using the general relationship:
`c=lambda*f`
Where:
`lambda` is wavelength;
`c=3xx10^8m/s` is the the speed of light in vacuum.
Rearranging the expresion for energy you get:
`E=h*c/lambda=6.63xx10^(-34)*(3xx10^8)/(3.10xx10^(-7))=6.42xx10^(-19)J`