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Two vessels of different materials are s...

Two vessels of different materials are similar in size and other respects. The same quantity of ice filled in them gets melted in 40 and 70 minutes respectively. The ration of thermal conductivities for the materials of boxes is :

A

`4:7`

B

`7:4`

C

`4:11`

D

None of these.

Text Solution

Verified by Experts

The correct Answer is:
B
`k=(Qd)/(A(T_(1)-T_(2))t)" "rArr" "kprop1/t`
`:.(k_(1))/(k_(2))=(t_(2))/(t_(1))=(70)/(40)`
`(k_(1))/(k_(2))=7/4`
Thus correct choice is (b).
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Knowledge Check

  • In Ingen Hauze's experiment, the wax melts up to lengths 10 and 25 cm on two identical rods of different materials. The ratio f thermal conductivities of the two materials is :

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