Question 12
- State two
- characteristics of nuclear reactions;
- applications of atomic radiations
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- State the relationship between half-life (T1/2) and decay constant (λ) of a radioactive element.
- A sample of radioactive nuclide has a decay constant of 1.36 x 10-4 s-1. Calculate its half-life.
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- Explain the wave-particle duality of light.
- 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:
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Characteristics of nuclear reaction
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- 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
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Applications of atomic radiation
- Treatment of (malignant) tumours
- Study of crystal structure
- Preservation of food stuffs
- Detection of fracture
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