The flash on a compact camera stores energy in a 120 F capacitor that is charged to

Question:

The flash on a compact camera stores energy in a 120 μF capacitor that is charged to 220 V. When the flash is fired, the capacitor is quickly discharged through a lightbulb with 5.0 Ω of resistance.
a. Light from the flash is essentially finished after two time constants have elapsed. For how long does this flash illuminate the scene?
b. At what rate is the lightbulb dissipating energy 250 μs after the flash is fired?
c. What total energy is dissipated by the lightbulb?