Question

A hot metal piece kept in air gets cool from 90°C to 80°C in t\(_1\) seconds, from 80 to 70°C in t\(_2\) seconds and from 70 to 60°C in t\(_3\) seconds. Under these circumstances, which of the following describes the relationship between t\(_1\), t\(_2\) and t\(_3\) ?

• A. t\(_1\) < t\(_2\) < t\(_3\)
• B. t\(_1\) > t\(_2\) > t\(_3\)
• C. t\(_1\) = t\(_2\) = t\(_3\)
• D. t\(_1\) = t\(_2\) + t\(_3\)

Hint:

As a hot object cools and approaches the ambient temperature, its rate of cooling slows down.
Therefore, it always takes progressively more time to cool through equal temperature intervals.

Answer 1

The Correct Option is A