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Which of the following statements are true regarding heat?

1. Heat is a form of energy

2. Heat can be reflected by a mirror

3. Heat is an electromagnetic radiation

4. Heat cannot pass through vacuum

1, 2 and 3

1, 2 and 4

2, 3 and 4

1, 3 and 4

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Explanation:

4th statement is incorrect because heat can pass through vacuum.
If not, how does the Sun heat the Earth? Heat travels through a vacuum by infrared radiation (light with a longer wavelength than the human eye can see). The Sun (and anything warm) is constantly emitting infrared, and the Earth absorbs it and turns the energy into atomic and molecular motion, or heat.