Question #0fb46

1 Answer
Mar 17, 2017

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