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10-2.Transmission of Heat
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આકૃતિ $2$ માં ઉષ્માનું વહન $12 sec$ માં થાય, તેટલી જ ઉષ્માનું વહન આકૃતિ $1$ માં થતાં ...... $\sec$ સમય લાગે ?
A
$24 $
B
$3 $
C
$1.5 $
D
$48 $
Solution
(d) Let the heat transferred be $Q$ .
When rods are joined end to end. Heat transferred by each rod$ = Q = \frac{{K2A\Delta \theta }}{l} \times 12$ …..$(i)$
When rods are joined lengthwise, $Q = \frac{{KA\Delta \theta }}{{2l}}t$ …..$(ii)$ From equation$(i)$ and $(ii) $we get $t = 48\;s$
Standard 11
Physics
