A) 60
B) 120
C) 240
D) 480
E) 720
Correct Answer: C
Solution :
\[P\times t=ms\Delta t\] \[\Rightarrow \]\[2.1\times {{10}^{3}}\times t=1.5\times 4200\] \[\times [(100+273)-(20{}^\circ +273)]\] \[\Rightarrow \]\[t=\frac{1.5\times 4200\times 80}{2.1\times {{10}^{3}}}=240\,s\]You need to login to perform this action.
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