Physics (AS & A Level) · Feb / March 2016 · Paper 42 · Question 11
9702
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11(a)[2]
minimum frequency for electron(s) to be emitted (from surface) reference to frequency of electromagnetic radiation / photon or frequency causing emission of electron(s) from surface with zero kinetic energy (M1) reference to frequency of electromagnetic radiation / photon (A1) [2]
11(b)(i)[2]
positive intercept on (1 / λ)-axis (when extrapolated) straight line with positive gradient [2]
11(b)(ii)[1]
gradient = hc where c is the speed of light [1]
11(b)(iii)[2]
maximum kinetic energy when electron emitted from surface energy is required to bring an electron to the surface [2]
11(b)(iv)[3]
each photon has more energy fewer photons per unit time fewer electrons per unit time / less current [3]
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