9702/52/O/N/16: A student is investigating the characteristics of different light-emitting diodes (LEDs). Each LED needs a minimum potential difference across it to emit light.The circuit is set up as shown in Fig. 2.1.
The potentiometer is adjusted until the LED just emits light. The potential difference V across the LED is measured.The experiment is repeated for LEDs that emit light of different wavelength λ. It is suggested that V and λare related by the equation V = pλ^q where p and q are constants.
Solutions for October/November 2016 Paper 5 variant 2 question 2 data analysis.
