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What is light?

Nature of light unit 5.1 - revision with Alex Monk

QuestionAnswer
E=hf is an equation you must be able to recognise and use. What does each letter stand for? E = Energy of photons; h = Planck's constant; and f = Wave frequency
When E=hf, what is the unit of 'h'? Js^-1
What is radiation flux a measure of? It is a measure of how intensely light shines on something
Flux = power/area. Give the unit of 'flux'? Wm^-2
State one application of Gamma waves Sterilising medical equipment is an example of an application...
Name one detector of X-Rays Photographic films
The absorption of a photon can result in the emission of a photoelectron. What is the name of this 'effect'? The photoelectric effect!
For a given surface, there is a minimum frequency of light below which no emission of photoelectrons occurs. What is this frequency known as? Threshold frequency
eV - what does this non-SI unit stand for? Electronvolt
On a negatively charged electroscope, what effect does UV light have on the gold leaf? The gold leaf falls (immediately)
Created by: alexmonk