00:01
For any given photon of light that has a specific wavelength, we can find its frequency and energy.
00:09
And that's what this problem is asking us to do.
00:11
It tells us that we have a wavelength of light that corresponds to the color blue, and the wavelength is 455 nanometers.
00:27
Most of our calculations will need to change this into meters.
00:30
So we know that every meter is equal to 10 to the 9 nanometers.
00:39
So our wavelength in meters is 455 .5 times 10 to the minus 9 meters, which we can rewrite, that's 4 .555 times 10 to the minus 7 meters.
01:01
Wave length and frequency are related using the constant value of the speed of light.
01:06
And so to find the frequency, frequency is equal to the speed of light divided by wavelength.
01:15
The speed of light is a constant value, three times 10 to the 8 meters per second.
01:22
And we use our answer in meters from above, 4 .555 times 10 to the minus 7 meters...