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K.C.S.E Physics Q & A - MODEL 2009PP2QN19

17/7/2020

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.

answers

K.C.S.E Physics Q & A - MODEL 2009PP2QN19

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Determine the speed of light in water given that the speed of light in air is 3.0 x 108 ms-1 and the refractive index of water is 1.33

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Give a reason why it is necessary to leave the caps of the cells open charging an accumulator.

K.C.S.E Physics Q & A - MODEL 2009PP2QN03

K.C.S.E Physics Q & A - MODEL 2009PP2QN02

Figure 1 shows a ray of light incident on a mirror at an angle of 450. Another mirror is placed at an angle of 450 to the first one as shown

State the number of images formed when an object is between two plane mirror placed in parallel

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(a) Define the term efficiency of a machine (b) Figure 9 shows a drum of mass 90 kg being rolled up a plane inclined at 250to the horizontal. The force F applied is 420N and the distance moved by the drum along the plane is 5.2 m

K.C.S.E Physics Q & A - MODEL 2009PP1QN15

(a) State two factors that affect the boiling point of a liquid (b) 100g of a liquid at a temperature of 100C is poured into a well lagged calorimeter An electric heater rated 50W is used to heat the liquid. The graph in figure 8 shows the variation of the temperature of the liquid with time.

K.C.S.E Physics Q & A - MODEL 2009PP1QN14

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Determine the speed of light in water given that the speed of light in air is 3.0 x 108 ms^-1 and the refractive index of water is 1.33

Figure 1 shows a ray of light incident on a mirror at an angle of 45⁰. Another mirror is placed at an angle of 45⁰ to the first one as shown

(a) Define the term efficiency of a machine
(b) Figure 9 shows a drum of mass 90 kg being rolled up a plane inclined at 25⁰to the horizontal. The force F applied is 420N and the distance moved by the drum along the plane is 5.2 m

(a) State two factors that affect the boiling point of a liquid
(b) 100g of a liquid at a temperature of 10⁰C is poured into a well lagged calorimeter
An electric heater rated 50W is used to heat the liquid. The graph in figure 8 shows the variation of the temperature of the liquid with time.