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Question

Halley comet revolves around the sun once in every 76 years. This is a:

A
photochemical change
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B
periodic change
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C
chemical change
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D
irreversible change
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Solution

The correct option is A periodic change

Halley's Comet is arguably the most famous comet. It is a "periodic" comet and returns to Earth's vicinity about every 75 years, making it possible for a human to see it twice in his or her lifetime. The last time it was here was in 1986, and it is projected to return in 2061.


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