A 50 -W incandescent light bulb emits about \(5.0 \mathrm{~W}\) of visible light. (The rest is converted to thermal energy.) If a circular aperture \(5.0 \mathrm{~mm}\) in diameter is placed \(1.0 \mathrm{~km}\) away from the light bulb, approximately how many photons reach the aperture each second?