A solar shower

This task is about explaining how a solar shower works.
Solar showers have bags which can hold up to 50 litres (L) of water.
If the bag is left on the ground in the Sun for a number of hours, the temperature of the water in it may rise to over 40 °C.
diagram of solar shower in the sun

Question 2Change answer

a)  Give a detailed description of why the water heats up.

Question 2Change answer

b)  Explain why the top surface of the bag is made of clear plastic.

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c)  Explain why the inside bottom surface of the bag is black.

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d)  Explain why the outside bottom surface of the bag is silver.

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e)  What temperature change would you expect if the solar shower bag was left in the Sun with the silver side facing upwards?