With reference to radioisotope thermoelectric generators (RTGs), consider the following statements:1. RTGs are miniature fission reactors.2. RTGs are used for powering the onboard systems of spacecraft.3. RTGs can use Plutonium-238, which is a by-product of weapons developments.Which of the statements given above are correct?
✓ Correct answer: b) 2 and 3 only
ExplanationRTGs are lightweight and compact devices that generate electricity from the heat produced by the natural radioactive decay of isotopes, typically Plutonium-238 .They are commonly used in space missions where solar power is insufficient, such as deep-space probes and rovers.Statement 1 is incorrect: RTGs generate heat through natural radioactive decay, not by controlled nuclear fission, which involves splitting atomic nuclei to release energy.Therefore, they cannot be classified as miniature fission reactors.Statement 2 is correct: Due to their lightweight, compact design, RTGs have been extensively used in space missions such as Voyager, Curiosity Rover, and Perseverance Rover.They offer a durable and reliable power source, especially for spacecraft operating in deep space, where solar panels are ineffective.Statement 3 is correct: Plutonium-238 is widely used in RTGs due to its high heat output during decay and low levels of unwanted radiation.While Pu-238 is not naturally occurring, it is mainly produced as a by-product of nuclear weapons development.For example, during the
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