0:00
All right.
00:01
So in this question, we are asked about the black body spectra of the sun versus light bolt.
00:08
So the sun has a surface temperature of about 6 ,000 kelvin.
00:27
And so the 6 ,000 kelvin curve best describes the sun.
00:43
And also, this also makes sense because the sun puts out visible light.
00:51
And that's where the spectrum for the 6 ,000 kelvin curve peaks and the 6 ,000 kelvin curve peaks in the visible range.
01:26
Meanwhile, a light bulb, so your average light bulb, the filament temperature, not the actual temperature of like the bulb, but the filament temperature is about 2 ,800 kelvin.
01:46
So the 3 ,000 kelvin curve would be the closest to our light bulb.
02:07
Now, if we then ask which produces the most intense light, so intense light, that's the sun, because again, its spectrum peaks at a higher intensity.
02:35
So if we look at our curves here, if this is the sun, and then we say this curve is our light bulb.
02:50
We can see the y -axis here is intensity, so the sun has a much more intense light than our light bulb, which makes sense considering it's the sun.
02:58
So it has a very intense output.
03:07
However, if we were to then ask, which produces the longest wavelength, so longest peak, wavelength, that is the light bulb.
03:34
And that's because here, once again, going up, we can see that for the sun, the peak wavelength is somewhere right here, whereas for the light bulb, it's somewhere right here.
03:55
So the wavelength is much longer for the light bulb at its peak intensity...