Physics Paper 2 WASSCE (PC), 2019

Question 12

 

  1. State two
    1. characteristics of nuclear reactions;
    2. applications of atomic radiations
    1. State the relationship between half-life (T1/2) and decay constant (λ) of a radioactive element.
    2. A sample of radioactive nuclide has a decay constant of 1.36 x 10-4 s-1. Calculate its half-life.
    1. Explain the wave-particle duality of light.
    2. An electron of mass 9.1 x 10-31 kg moves with a speed of 6.5 x 107 m s-1. Calculate the wavelength of the waves associated with the electron.

Observation

The expected answer is:

    1. Characteristics of nuclear reaction
      • Mass is converted to energy
      • Not affected by pressure
      • Not affected by temperature
      • Does not depend on the state of the nuclide
      • Charge is conserved
    2. Applications of atomic radiation
      • Treatment of (malignant) tumours
      • Study of crystal structure
      • Preservation of food stuffs
      • Detection of fracture