K.C.S.E Physics Q & A - MODEL 2002PP2QN02

K.C.S.E Physics Q & A - MODEL 2002PP2QN02

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​Fig. 3. Shows the path of radiation form a radioactive source after entering a magnetic field. The magnetic field is directed into the paper and is perpendicular to the plane of the paper as shown in the figure

​Identify the radiation
b) Below is a nuclear reactio

​i) Identify radiation K
ii) Determine the values of X and Y.
(c) Fig 3 shows a device for producing metal foils of constant thickness. Any change in thickness can be detected by the Geiger tube and recorded by the Geiger. The pressure adjusted by the roller is then adjusted to keep the thickness constant.

​(i) State the change in the metal foil that will lead to a decrease in the Geiger counter reading
(ii) Give a reason for your answer in c(i) above
(iii) State the change in the roller pressure that should be made as a result of this decrease in the Geiger counter reading.
(iv) Give a reason for your in (c) (iii) above
(v) Explain why a source emitting (alpha) particles only would not be suitable for this device.
(vi) Explain why a radioactive source of a half-life of 1600 years is more suitable for use in the device than one of a half-life of 8 minutes.

answers