Number of photons emitted per second….?
A sodium-vapor lamp has a power output of 1921 W. Using 587.5 nm as the average wavelength of this source, calculate the number of photons emitted per second.
I can’t seem to get ahold of this question. Here’s what I thought would work. I know that 1 watt = 1 J/s. So, I figured I need to get the energy of the photons emitted. I used the equation E = hc/lambda. Knowing all of the necessary value, I was able to obtain an answer for E, to which I thought I could just divide the number given for power by, Power/Energy. But this wasn’t the case. Any help would be appreciated.
Your method is absolutely correct.
The only hiccup I can think of is that you failed to convert nm to meters. If h is given in Js, you need the wavelength in m and c in m/s if you want the energy to come out in joules.
Recheck your numbers and try again.
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