K.C.S.E Physics Q & A - MODEL 1999PP2QN01

K.C.S.E Physics Q & A - MODEL 1999PP2QN01

a) Distinguish between longitudinal and transverse waves
b) In the Young‟s double slit experiment, and interference pattern of bright and dark fridges was formed as shown in figure 1 by alight of wavelength coming from two narrow slits X and Y.

​i) Write an expression for the path difference between XP and YP where corresponds to the 2nd bright fringe.
ii) Explain how the dark and bright fringes are formed.
iii) State and explain what would be observed on the screen if the slits X and Y were made large.
c) Figure 2 represents a displacement – time graph for a wave.

​i) Determined the frequency of the wave.
ii) Sketch on the same axes, the displacement – time graph of a wave of the same frequency but 180 out of phase and with a smaller amplitude.

answers