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Jodie investigates the properties of silvery and black surfaces asabsorbers of radiation. She sets up two conical flasks full ofwater, one covered with aluminium foil and the other painted black.

a) Describe how she investigates which of the two surfaces is the best absorber of heat radiation. Your answer should include:
- A description of the method used.
- The measurements taken.
- A sketch of the graphs obtained.
- Two precautions taken.
- The conclusion

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