Question

Assertion :A light-year is a distance that light travels with velocity of $3\times {10}^8$ $m{s}^{-1}$ in one year. Reason: Light year is the unit for measuring time.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about $300,000$ kilometers (km) each second. So in one year, it can travel about 10 trillion km.

So assertion is correct but reason is incorrect