Photons per second from lightbulb

[Kavorka]

Homework Statement

[/B]
If 5 percent of the power of a 100 W bulb is radiated in the visible spectrum, how many visible photons are radiated per second?

Homework Equations

E=hf=hc/λ

The Attempt at a Solution

I know how to solve this, I just wanted to make sure.
I will take 5 W or J/s as the power of the visible light, and once you know the energy of the visible light's photon in Joules finding the photons/second is easy. I am wondering though if it would be better to present a range of photons per second since the visible spectrum is a range of frequencies/wavelengths, or an average. The question seems like it wants a single answer.

 

[Kavorka]

um

 

[SammyS]

Homework Statement

[/B]
If 5 percent of the power of a 100 W bulb is radiated in the visible spectrum, how many visible photons are radiated per second?

Homework Equations

E=hf=hc/λ

The Attempt at a Solution

I know how to solve this, I just wanted to make sure.
I will take 5 W or J/s as the power of the visible light, and once you know the energy of the visible light's photon in Joules finding the photons/second is easy. I am wondering though if it would be better to present a range of photons per second since the visible spectrum is a range of frequencies/wavelengths, or an average. The question seems like it wants a single answer.

Surely you could find a range. Then pick some reasonable answer in the middle.

You might assume white light - so an even distribution of frequencies, The energy is proportional to the frequency, so you get a nice energy distribution. Integrate over that someway.

Want to make things even more complicated? - - -

 

[Kavorka]

Haha that's alright. I found a range as well as the average and will list those both, hopefully that is a satisfactory answer.