00:02
For this problem, we're told that heated lithium emits photons with an energy of 2 .961 times 10 to the negative 19th joules per photon.
00:12
What we're asked to do is to calculate the frequency of light emitted from these photons, the wavelength of light, as well as the total energy in a mole of these photons, and finally what the color of this light would look like.
00:28
So first to calculate the frequency, we're going to use this first equation here to the left.
00:33
And we're going to solve it in terms of frequency, which is going to equal the given energy, which is again 2 .961 times 10 to the negative 19th joules.
00:43
And then we're going to divide that by planck's constant.
00:47
And the value that we will get out of that is going to be the frequency, which in this case is 4 .48 times 10 to the 14th hertz.
00:58
We can then use this frequency value to calculate the corresponding wavelength of this light...