, calculate the adsOTUar Compare PALU the ratio of the % photons absorbed to the
ID: 545110 • Letter: #
Question
, calculate the adsOTUar Compare PALU the ratio of the % photons absorbed to the UL LIU. Prelab Question #3: Light has For some both particle and wavelike properties.. Light can be described as an electromagnetic wave. "Y, only the electric field portion of light is shown below: A = 700 nm A = 350 nm a) Visually, which wave appears to be higher in energy explain your reasoning. Check your guess by calculating the energy of each light-wave. Express your answer in Joules. b) Convert these energies to the unit of electronvolt (eV): 1 Joule = 6.2415 x 1018 ev Why do you think molecular/atomic energies are often reported in eV? 31Explanation / Answer
a)
wavelength is less for right one
Since:
E = h*c/wavelength
Energy will be larger of right one
Lets do the calculation:
for left one:
use:
E = h*c/lambda
=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(7*10^-7 m)
= 2.84*10^-19 J
for right one:
use:
E = h*c/lambda
=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(3.5*10^-7 m)
= 5.679*10^-19 J
b)
for left one:
E = 2.84*10^-19 J
= 2.84*10^-19 eV / (1.602*10^-19)
= 1.77 eV
for right one:
E = 5.679*10^-19 J
= 5.679*10^-19 eV / (1.602*10^-19)
= 3.54 eV
values looks better in eV. In J they are very strong, This is the reason they are expressed in eV
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