Recent content by Paul37

well i tried it today and a blue LED started at 2.50V but the voltage went well above 5V and the LED just became brighter. I'm in Scotland by the way. Part of an investigation

Planck constant "V" in E=qV question 1. Homework Statement I am trying to prove Planck's constant using LEDs. So far I have measured several LED's wavelengths using a spectrometer and from this their frequency. This will be f in the equation h = E/f. For E I put the LEDs in a forward biased...