K.C.S.E Physics Q & A - MODEL 2004PP2QN06

K.C.S.E Physics Q & A - MODEL 2004PP2QN06

​a) You are provided with two identical tuning forks and some plasticine.
Describe how you would demonstrate beats in sound.
b) Fig 8 shows a set up that was used in an experiment to determine the speed of sound air

Turning forks of different frequencies were sounded near the mouth of the open tube and by lowering the reservoir, the list two resonant lengthsL1 L2 were ensured for each frequency.
Table 1 shows the results obtained.

​(i) Complete the table. On the grid provided, plot the graph of l2– l1 (y-axis ) against 1/f
(ii) From the graph determine the speed V of sound in air given that
12-11 = v/2r. Therefore V= 2f(12 – 11)
(iii) Explain how resonance is attained in this set up.

answers