Why do some LEDs generate a photovoltage in some LEDs but not inother LEDs (Table 3)? Which color LED generated photovoltage in the most LEDs andwhy? Which color LED generated a photovoltage in the fewest LEDs andwhy?Why does white light generate a voltage in all the LEDs?

Table 3.Voltage generated by different colored LEDs. Photovoltaic LED Red Amber Green Blue Voltage (mV) generated as a function of the color of LED used to excite photovoltaic LED in first column. (Room lights must be turned off.) ambient Red Amber Green Blue light 315 330 42 120 Na X XX 1400 Na X X 107 18 Na X 47 35 100 Na