Example
Calculate the frequency of the photons whose energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More is required to eject surface electron with a k.e of 3.8 x 10-17eV and the work function of the metal is 2.66 x 10-17eV.
E = hf – hf0
Hf = E + hf0
f = \( \frac{E + hf_0}{H} \)
f = \( \frac{3.80 \times 10^{-17} + 2.66 \times 10 {-17}}{6.6 \times 10 {-34}} \)
f = \( \frac{6.46 \times 10^{-17} + 1.6 \times 10 {-19}}{6.6 \times 10 {-34}} \)
= 2.42 x 1014Hz
Responses