An LED has a forward voltage drop of 2.25 V. As seen in thefigure, it is in series with: an AC source of V(t)=V0sin(2πft) withV0= 4.00 V, f=1 Hz, and a resistor R= 200 Ω
d. The whole flash:
1) If you were watching the LED, you would see it turn on and offwith a period of 1s. During the 1s period, compute how long the LEDis on (the time Δt of each pulse).
2) How much light energy is emitted during the entire LED lightpulse? Hint: you first need to find the total photons emittedduring the whole light pulse.
