Nature of light unit 5.1 - revision with Alex Monk
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| 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
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| When E=hf, what is the unit of 'h'? | Js^-1
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| What is radiation flux a measure of? | It is a measure of how intensely light shines on something
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| Flux = power/area. Give the unit of 'flux'? | Wm^-2
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| State one application of Gamma waves | Sterilising medical equipment is an example of an application...
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| Name one detector of X-Rays | Photographic films
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| The absorption of a photon can result in the emission of a photoelectron. What is the name of this 'effect'? | The photoelectric effect!
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| 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
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| eV - what does this non-SI unit stand for? | Electronvolt
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| On a negatively charged electroscope, what effect does UV light have on the gold leaf? | The gold leaf falls (immediately)
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