K.C.S.E Physics Q & A - MODEL 2019PP2QN16
(a) Define the following terms as used in waves:
(b) Figure 8 shows water waves approaching a straight reflector at a speed of 40 cm/s.
(I) Draw on the diagram the reflected waves.
(ii) Given that the distance between the source and the reflector is 15 cm determine:
I. the wavelength of the waves
II. the frequency of the waves
(c) Figure 9 Shows light rays from two coherent sources S1 and S2 falling on a screen.
Dark and bright fringes are observed between A and B
(i) State how:
I. bright fringes are formed
II. dark fringes are formed
(ii) State what is observed when light of a higher frequency is used.
(a)(i)Amplitude is the maximum displacement of a particle from the mean position
(ii)Wavelength is the distance between two successive points in a wave which are in phase
Distance between two successive crests or troughs in a transverse
Wave/between rarefaction or compressions in a longitudinal wave.
(c)(I) due to constructive interference
(II) due to destructive interference
(ii) The fringes get closer
When the frequency is higher the wavelength reduces hence the fringe separation decreases
K.C.S.E Physics Q & A - MODEL 2018PP2QN19
Figure 8 shows two waves of nearly equal frequency produced simultaneously.
On the space provided, sketch the resultant of the two waves (beats).
(b) Figure 9(a) and 9(b) show barriers placed in the path of plane waves.
On each figure, sketch the pattern of waves after they pass the barrier.
(c) Figure 10 shows a displacement—distance graph for a certain wave motion.
(i) Indicate on the figure with letters A and B any two points that are in phase.
(ii) Determine the:
(I) amplitude of the wave
(II) wavelength of the wave
(iii) Given that the frequency of the waves is 50 Hz, determine the:
(II) speed of the wave
K.C.S.E Physics Q & A - MODEL 2018PP2QN17
(a) Water waves from a certain Source move from the shallow end to the deep end. State the change that occurs at the deep end on the following:
(b) (i) A biconvex lens forms an upright image twice the size of the object. If the focal length of the lens is 20cm, determine the object distance.
(ii) State two optical instruments which produce a magnified real image using a Convex lens.
(c) State one difference between the working of the human eye and the lens of a camera.
(d) A lens of focal length 2Ocm forms a virtual image when an object is placed 60cm from the lens. State with a reason the type of lens used.
(a)(i) No change in frequency
(ii) Wavelength increases
(iii) Velocity increases
(ii) a film projector
A compound microscope
(c) In a camera focusing is done by changing the distance between the lens and the film. While in the eye focusing is done by changing the curvature of the lens.
d) Diverging lens
Forms a virtual image when the object distance is greater than the focal length.
K.C.S.E Physics Q & A - MODEL 2017PP2QN12
Figure 3 shows a transverse wave.
Determine the frequency of the wave.
K.C.S.E Physics Q & A - MODEL 2016PP2QN06
Figure 4 shows straight waves incident on a diverging lens placed in a ripple tank to reduce its depth
Complete the diagram to show the waves in both the shallow region and beyond the lens.
FORM I - PHYSICS SYLLABUS
FORM II - PHYSICS SYLLABUS
FORM III - PHYSICS SYLLABUS
FORM IV - PHYSICS SYLLABUS
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