Answered

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

Verified Answer :

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\(3.97\times 10^{-19} Joules\).

Related Questions