K.C.S.E Physics Q & A - MODEL 1996PP1QN33

K.C.S.E Physics Q & A - MODEL 1996PP1QN33

α- particles are more ionizing than beta- particles. Give one reason for this

In the figure 7 the circuit diagram contains bulbs B, a transistor T and a resistor R. A diode D is connected between points Y and X as shown. In the set up bulb B is not lit. When the connections YP and XQ are made, B lights. Answer questions 34, 35 and 36 with reference to the figure.
Name the type of transistor used in the circuit 
Explain the observation when the connections are made 

answers

• Low speed / high charge / more massive/ size is large/ bigger`
• n-p-n
• Limit the current through the base controls the current/ protect transistor from high current or voltage/ regulate reduce voltage.
• Diode  is forward biased; Base currents flows; hence  collector current flows and lights the bulb/ current amplification   air molecule are in constant random motion; smoke particles collide  with these air molecules hence their random motion