graad 12 national senior certificate grade 12 - Department of Basic ...
graad 12 national senior certificate grade 12 - Department of Basic ...
graad 12 national senior certificate grade 12 - Department of Basic ...
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Physical Sciences/P1 7 DBE/Feb.–Mar. 20<strong>12</strong>NSC2.9 When light shines on a metal plate in a photocell, electrons are emitted.The graph below shows the relationship between the kinetic energy <strong>of</strong> theemitted photoelectrons and the frequency <strong>of</strong> the incoming light.D•kinetic energy (J)A0 •B•C•frequency (Hz)Which ONE <strong>of</strong> the points (A, B, C or D) on the graph represents the thresholdfrequency?ABCDABCD (2)2.10 Overexposure to sunlight causes damage to plants and crops.Which ONE <strong>of</strong> the following types <strong>of</strong> electromagnetic radiation is responsiblefor this damage?ABCDUltraviolet raysRadio wavesVisible lightX-rays (2)[20]TOTAL SECTION A: 25Copyright reservedPlease turn over
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