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Physical Sciences/P1 16 DBE/Feb.–Mar. 2012NSCQUESTION 11 (Start on a new page.)In the diagram shown below, electrons are released from a metal plate when light of acertain frequency is shone on its surface.incident lightmetal surfacee -A11.1 Name the phenomenon described above. (1)11.2 The frequency of the incident light on the metal plate is 6,16 x 10 14 Hz andelectrons are released with a kinetic energy of 5,6 x 10 -20 J.Calculate the:11.2.1 Energy of the incident photons (3)11.2.2 Threshold frequency of the metal plate (5)11.3 The brightness of the incident light is now increased. What effect will thischange have on the following: (Write down only INCREASES, DECREASESor REMAINS THE SAME.)11.3.1 The reading on the ammeterExplain the answer. (2)11.3.2 The kinetic energy of the released photoelectronsExplain the answer. (2)[13]TOTAL SECTION B:GRAND TOTAL:125150Copyright reserved
Physical Sciences/P1 1 DBE/Feb.–Mar. 2012NSCDATA FOR PHYSICAL SCIENCES GRADE 12PAPER 1 (PHYSICS)GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12VRAESTEL 1 (FISIKA)TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTESNAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDEAcceleration due to gravitySwaartekragversnellingg 9,8 m·s -2Speed of light in a vacuumSpoed van lig in 'n vakuumc 3,0 x 10 8 m·s -1Planck's constantPlanck se konstanteh6,63 x 10 -34 J·sCoulomb's constantCoulomb se konstantek 9,0 x 10 9 -2N·m2·CCharge on electronLading op elektrone-1,6 x 10 -19 CElectron massElektronmassam e9,11 x 10 -31 kgPermittivity of free spaceε0Permittiwiteit van vry ruimte8,85 x 10 -12 F·m -1Copyright reservedPlease turn over
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