K.C.S.E Physics Q & A - MODEL 2009PP2QN19
​Figure 12 shows a set up for observing interference of waves from two sources S1 and S2. The points C and D represent positions of the constructive and destructive interference respectively as observed on the screen
​(a) If the observation was made in a ripple tank, describe:
(i) How the constructive and destructive interferences are identified (b) Explain how the constructive interference C and the destructive interference D patterns are produced. Draw: (i) The line joining all points where waves from S1 and S2 have traveled equal distance. Label it A (ii) The line joining all points where waves from S2 have traveled one wavelength further than the waves from S1. Label it B.
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K.C.S.E Physics Q & A - MODEL 2009PP2QN18
​(a) It is observed that when ultra- violet radiation is directed onto a clean zinc plate connected to the cap of a negatively charged leaf electroscope, the leaf falls
(i) Explain this observation (ii) State why this observation does not occur if the electroscope is positively Charged (iii) Explain why the leaf of the electroscope does not fall when infra- red radiation is directed onto the zinc plate (b) State the effect on the electrons emitted by the photoelectric effect when:
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M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses
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