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Beta particles are

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Here are the answers to the questions:

  1. D. electrons. Beta particles are high-energy electrons (or positrons) emitted from the nucleus of an atom during radioactive beta decay.

  2. B. one million times. Assuming "m" refers to "millimetre" (mm), we can convert units:

  1. Convert kilometres to metres.

    $$
1 \text{ kilometre} = 1000 \text{ metres}
$$

  2. Convert metres to millimetres.

    $$
1 \text{ metre} = 1000 \text{ millimetres}
$$

  3. Calculate the total conversion from kilometres to millimetres.

    $$
1 \text{ kilometre} = 1000 \text{ metres} \times 1000 \frac{\text{millimetres}}{\text{metre}} = 1,000,000 \text{ millimetres}
$$
Therefore, a kilometre is one million times larger than a millimetre.
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