With reference to radioisotope thermoelectric generators (RTGs), consider the following statements:
- RTGs are miniature fission reactors.
- RTGs are used for powering the onboard system of spacecrafts.
- RTGs can use Plutonium-238, which is a by-product of weapons development.
Which of the statements given below are correct?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Correct Answer: (b) 2 and 3 only
Explanation:
- Statement 1 is incorrect because RTGs are not miniature fission reactors; they use the decay of radioactive isotopes (not fission reactions) to generate electricity.
- Statement 2 is correct as RTGs are commonly used to power the onboard systems of spacecraft, especially those sent to deep space where solar power is not feasible.
- Statement 3 is correct because Plutonium-238, which is used in RTGs, can be a by-product of nuclear reactors and weapons development.
Possible Sources: Physics and space exploration references on RTGs.
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