Describe one technique you could use to measure the threshold voltage for LEDs.
A sensitive ammeter is placed in series with LED. With the increase in Voltage, measure the potential difference value when it starts conducting. Black-out and shaded vision tube is used to observe the voltage value when visible light is first observed as the voltage is increased.
MP
Related Physics A Level answers
All answers ▸A cylindrical specimen of material with diameter 1.5x10^-4 has a breaking stress of 1.3GPa. Calculate the tensile force acting on the specimen at breaking point.
Given a graph of the displacement of a particle, how can you tell if it is in Simple Harmonic Motion?
I have trouble visualizing simple harmonic motion, and remembering all the related equations. How should I think about it?
How does one calculate centripetal force?