K.C.S.E Physics Q & A - MODEL 2000PP2QN06

K.C.S.E Physics Q & A - MODEL 2000PP2QN06

a) State the necessary conditions for interference to occur in waves
b) Fig 9. Drawn to scale of 1: 200 shows two speakers L1 and L2 connected to a signal generator (not shown) producing sound waves of frequency 350Hz. An observer walking along PQ hears loud and low sounds at alternative positions.

​(i) Explain how the observations made are caused
(ii) At point O a loud sound is heard and at point A, the next loud sound is heard. Use this information and the diagram to determine the velocity of sound in air.
(iii) State and explain the effect of increasing the frequency of the signal generator on the distance OA.

answers