Question

Question #514c5

Answer 1

I got: `=4.5xx10^-19J`

Explanation:

We can evaluate this difference by using Einstein's formula:

`E=hf`

where:
`h=` Planck's Constant `=6.63xx10^-34Js`
`f=` frequency; we can evaluate frequency from the given wavelength `lambda=441.6xx10^-9m` using:
`c=lambdaf`
where `c=3xx10^8m/s` is the speed of light in vacuum.
So, we get:
`E=hc/lambda=6.63xx10^-34*(3xx10^8)/(441.6xx10^-9)=4.5xx10^-19J`