00:01
The concept involved here is planck theory of electromagnetic radiation which says that the energy of radiation, e, that is directly proportional to the frequency of radiation new.
00:11
And if i remove this proportional design, then this becomes e is equals to h new.
00:17
So here since we know that new, that is frequency, that is equals to c divided by lambda.
00:24
So c is the speed of light, lambda is the wavelength.
00:27
So, therefore, we can also write that e is equal to hc divided by lambda.
00:36
Now putting the values we have, so energy e is equal to h is plank constant, that is 6 .626, multiplying 10x to power minus 34, joules second.
00:50
Multiplying c is the speed of light, that is 3 multiplied by 10 % to 10 % meter per second.
00:58
Divided by lambda that is 455 nanometer now see this is nanometer this is meter per second so i have to convert this so we will convert nanometer to meter and that will be since one nanometer that is equals to 10 x to power minus 9 meter so this will be multiplying 10 to power minus 9 meter now solving this energy e will be equal to so this will be 19 .878 multiplying 10 raised to power minus 34 and this is here 10 to power 8 and this is here 10 to power minus 9 so when this will be taken to numerator side so this will be positive power and then we can say that 10 raised to power 8 multiplying 10 to power 9 okay and divided by 455 and solving the units we will get the answer in jule so energy e is equal to so this will be 0 .0 4368 and multiplying 10 raise to power minus 17 okay so this will be 9 8 17 and when we solve the powers we will get minus 17 jule so when i shift the decimal so this will become 4 .368 multiplying 10 raise to power minus 19 jule so this is the energy in jule so this is the energy for one photon okay energy of one photon now the plank theory also says that the energy travels in the form of small energy radiations and these small energy radiations are called photons.
03:09
Okay...