K.C.S.E Physics Q & A - MODEL 1996PP2QN07
(a) Describe with the aid of a diagram an experiment set up for observing photoelectric effect
(b) Table 2 shows the relationship between the wavelength, of a radiation falling on the surface and the energy, k of the emitted electrons 
(i) Plot a graph of energy k ( y – axis) against the frequency, f, of the incident light
(ii) Determine the work function Φ of the surface used (Speed of light, c = 3.00 * 108 ms-1 planks constant h = 6.663 * 10-34JS)
answers
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K.C.S.E Physics Q & A - MODEL 1996PP2QN06
(a) The fig. 4 shows the diagram of set up to investigate the variation of centripetal with the radius r, of the circle in which a body rotated
Describe how the set up can be used to carry out the investigation
Table 1 shows results obtained from an investigation similar to the one in part (a)
(i) Plot a graph of force, F ( y- axis) on the body against the radius , r, ( in meters) (ii) Given that the mass of the body is 100g, use the graph to determine the angular velocity,
K.N.E.C ANSWERS
(a) Keep angular velocity Wl constant;
Centripetal force provided by mg; Fix the mass m and measure of m; Repeat for different values of m; 
K.C.S.E Physics Q & A - MODEL 1996PP2QN05
(a) (i) What is the difference between longitudinal and transverse waves?
(ii) State two distinctions between the way sound waves and electromagnetic waves are transmitted (b) A mineworker stands between two vertical cliffs 400m from the nearest cliff. The cliffs are X distance apart. Every time he strikes the rock once, he hears two echoes, the first one after 2.5 s, while the second follows 2s later. From this information; calculation: (i) The speed of the sound in air (ii) The value of X (c) In an experiment to observe interference of light waves a double slit is placed close to the source. See figure 
(i) State the function of the double slit
(ii) Describe what is observed on the screen (iii) State what is observed on the screen when I. The slit separation S1S2 is reduced II. White light source is used in place of monochromatic source
answers
(a) (i) Particles of the transmitting medium vibrate in the direction of the wave for a longitudinal wave, but at right angles for a transverse wave:Sound requires medium but no medium required for electromagnetic wave; speed of sound lower than that of electromagnetic wave;
(c) (i) Double slit provides coherent sources;
(ii) Dark and bright fringes; The central fringe is the brightest while the intensity of the other fringes reduces away from the central fringe; (iii) I. The separation of fringes increases II. Central fringe is white; fringes on either side are colored; K.C.S.E Physics Q & A - MODEL 1996PP2QN04(a) (i) Describe the experiment to determine the specific heat capacity C, of a block of aluminium with two holes drilled in it, to accommodate a thermometer and an electric immersion heater
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