What are the answers to these physics questions about thermal conductivity and light dispersion?

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2(f)(i)
If a copper can was used instead of a plastic cup, the temperature of the substance inside would change faster.

2(f)(ii)
Copper is a good thermal conductor, meaning it transfers heat efficiently. Plastic is a poor thermal conductor (an insulator), so it transfers heat much less efficiently. Therefore, heat will be gained or lost more quickly through a copper can, leading to faster temperature changes.

3(a)
X: Prism
Y: Screen

3(b)(i)
The phenomenon illustrated in Figure 3 is the dispersion of light.

3(b)(ii)
On equipment Y, a spectrum of colors (e.g., Red, Orange, Yellow, Green, Blue, Indigo, Violet) would be observed.