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10-1.Thermometry, Thermal Expansion and Calorimetry
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${m_1},\,{m_2},\,{m_3}$ દળના ત્રણ પદાર્થોને ભેગા કરવામાં આવે છે. જો તેમની વિશિષ્ટ ઉષ્મા અનુક્રમે ${c_1},\,{c_2},\,{c_3}$ છે.અને તાપમાન અનુક્રમે ${T_1},\,{T_2},\,{T_3}$ છે. તો મિશ્રણનું તાપમાન કેટલુ થાય?

A

$\frac{{{c_1}{T_1} + {c_2}{T_2} + {c_3}{T_3}}}{{{m_1}{c_1} + {m_2}{c_2} + {m_3}{c_3}}}$

B

$\frac{{{m_1}{c_1}{T_1} + {m_2}{c_2}{T_2} + {m_3}{c_3}{T_3}}}{{{m_1}{c_1} + {m_2}{c_2} + {m_3}{c_3}}}$

C

$\frac{{{m_1}{c_1}{T_1} + {m_2}{c_2}{T_2} + {m_3}{c_3}{T_3}}}{{{m_1}{T_1} + {m_2}{T_2} + {m_3}{T_3}}}$

D

$\frac{{{m_1}{T_1} + {m_2}{T_2} + {m_3}{T_3}}}{{{c_1}{T_1} + {c_2}{T_2} + {c_3}{T_3}}}$

Solution

$down\ to\ 0°C =$ ${m_1}{c_1}{T_1} + {m_2}{c_2}{T_2} + {m_3}{c_3}{T_3}$ ….. $(i)$

$0°C\ to\ T°C =$ ${m_1}{c_1}T + {m_2}{c_2}T + {m_3}{c_3}T$ …..$(ii)$

$({m_1}{c_1} + {m_2}{c_2} + {m_3}{c_3})\,T$= ${m_1}{c_1}{T_1} + {m_2}{c_2}{T_2} + {m_3}{c_3}{T_3}$

$\Rightarrow$  $T = \frac{{{m_1}{c_1}{T_1} + {m_2}{c_2}{T_2} + {m_3}{c_3}{T_3}}}{{{m_1}{c_1} + {m_2}{c_2} + {m_3}{c_3}}}$.

Standard 11
Physics

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