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Physics > QUESTIONS & ANSWERS > AQA-A-Level-Physics-(2015)---Hidden-Formulae. (All)

AQA-A-Level-Physics-(2015)---Hidden-Formulae.

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???????? ?ℎ???? = ? ? This is the charge to mass ratio for a particle/nucleus/ion. (???−1) 1?? = 1.6 × 10−19 ? Planck’s constant ℎ = 6.63 × 10−34 ?? ? = ℎ? = ℎ? ? The energy ... of a photon of EM radiation is directly proportional to its ? = ℎ?0 frequency The work function, ? is the minimum amount of energy needed to release an electron from the surface of a metal The threshold frequency, ?0 is the minimum frequency of EM radiation needed to release an electron from the surface of a metal The kinetic energy of photoelectrons is up to a maximum because: • Photons are absorbed by electrons on a one to one basis • Some electrons are deeper in the metal than others • This means that they require more energy than the work function to be released, so their kinetic energy will be lower than those from the surface Particles with a larger momentum will have a smaller de Broglie wavelength. ??(???) = ??? Stopping potential, ?? is the potential difference needed to stop the fastest moving electron in a photocell experiment [Show More]

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