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Two identical sheets of metal are welded...

Two identical sheets of metal are welded end to end as shown in Fig. 11.19. 20 J of heat flows through 0°C it in 4 cm. If the sheets are welded as shown in Fig. (b), find the time taken for the same amount of heat to flow through the sheets.

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Verified by Experts

The correct Answer is:
60 seconds
`20 = K xx ("lt") xx 100 xx H//2l = K xx (2"lt" ) xx 100 xx t//l, t =1 "minute" = 60 "s"`
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