Question

Light with a wavelength of 5.0 · 10-7 m strikes a surface that requires 2.0 ev to eject an electron. Calculate the energy, in joules, of one incident photon at this frequency.
_____ joules

Answer 1

6.2 x 10^-13 is your answer

Answer 2

Answer:The energy, in joules, of one incident photon at this frequency$3.97\times 10^{-19} Joules$.

Explanation:

The wavelength of the light = $\lambda =5.0\times 10^{-7} m$

Energy of a single photon is given by the expresssion:

$E=\frac{hc}{\lambda }$

h = Planck's constant

c = speed of light

$E=\frac{6.626\times 10^{-34} J.s\times 3\times 10^8 m/s}{5.0\times 10^{-7} m}=3.97\times 10^{-19} Joules$

The energy, in joules, of one incident photon at this frequency$3.97\times 10^{-19} Joules$.