FUNPHYS Assignment 4 - Radioactivity STUDENT ID Number:
Name:
(a) Briefly describe what factors determine whether a nucleus is either stable or unstable? [4
marks]
(b) In relation to radiation exposure and dose, explain the terms Quality Factor (QF) and Tissue
Weighting Factor (TWF). [4 marks]
(c) 1311 has a radioactive half life of 8 days. The biological half life of 131| in the thyroid is 15 days.
Calculate the Effective Half Life? [2 marks]

Which feature of a heating curve indicates a change ofn state

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?