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Class-10 | Bengali | Chapter Name 3 lîô ö×!” þöèþï•þ!îKþyl •þyþ› CHAPTER-6 6.1 è)þ!ô†þy •þyþ› ¥¡ ~†þ 2̆þyöìîûîû ¢!_« ëy ö†þyöìly ëy!sf†þ þ›m*!•þ Séy’þüy¥z ~†þ îéÝ öíöì†þ xlÄ îéÝöì•þ 2Ìîy!¥•þ ¥ëûÐ •þyþ› @ýÌ¥” †þîûöì¡ îéÝ ’þz_® ¥öìëû ëyëû ~î‚ î?Ål †þîûöì¡ ‘þyuþy ¥öìëû ëyëûÐ ~¥z ¢!_«öì†þ xyôîûy ÖTM%ôye xl%èþî †þîûöì•þ þ›y!îûÐ 6.2 †þÄyöì¡y!îû!ô!•þ •þyþ› ~†þ TMîûöìlîû 2Ìy†,þ!•þ†þ îûy!¢Ð ~!Øþ ‡%î •þy’þüy•þy!’þü ~†þ îéÝ öíöì†þ xþ›îû îéÝöì•þ ¤Méþy!¡•þ ¥öì•þ þ›yöìîûÐ !†þév ö†þyöìly îéÝ †þ•þØþy ’þz_® îy †þ•þØþy ‘þyuþy •þy xyôîûy þ›!îûôyþ› †þîûöì•þ þ›y!îûÐ öë þ›m*!•þöì•þ îéÝ ˆ,¥#•þ îy î!?Å•þ •þyöìþ›îû þ›!îûôyþ› †þîûy ¥ëû •þyöì†þ †þÄyöì¡y!îû!ô!•þ îöì¡Ð xyôîûy ?y!l– ë! ̃ îéÝîû èþîû m– îéÝîû xyöìþ›!Çþ†þ •þyþ› s G ’þz£k•þyîû þ›!îûî•Åþl t ¥ëû •þöìî– Q = mst ˆ,¥#•þ îy î!?Å•þ •þyþ› = îéÝîû èþîû × xyöìþ›!Çþ†þ •þyþ› × ’þz£k•þy î,!m* îy ¥Éy¤ ö†þyöìly îéÝîû ~†þ†þ èþöìîûîû •þyþ›ôyey 1° î,!m* †þîûöì•þ ¥öì¡ öë þ›!îûôy” •þyþ› 2Ìöìëûy?l •þyöì†þ G¥z îéÝîû xyöìþ›!Çþ†þ •þyþ› îöì¡Ð xyöìþ›!Çþ†þ •þyþ›öì†þ ‘s’ myîûy 2̆þy¢ †þîûy ¥ëûÐ xyöìþ›!Çþ†þ •þyöìþ›îû CGS þ›m*!•þöì•þ ~†þ†þ ¥¡ †þÄyöì¡y!îûù @ýÌyô °C G SI þ›m*!•þöì•þ ~†þ†þ ¥¡ ?%¡ùö†þ!? ö†þ¡!èþlÐ xyöìþ›!Çþ†þ •þyöìþ›îû ôyey ¥¡ [L2 T–2K–1]Ð 6.2.1 †þÄyöì¡y!îû!ô!•þîû ô)¡l#!•þ: TM!îû ̃%!Øþ îéÝ þ›y¢yþ›y!¢ îûy‡y ¥¡Ð ~†þ!Øþ îéÝ öî!¢ ’þz£k ~†þ!Øþ †þô ’þz£kÐ ~îyîû îéÝ ̃%!Øþöì†þ ~öì†þ xþ›öìîûîû ¤‚ß›öì¢Å xylöì¡ 2Ìíöìô öë îéÝ!Øþîû ’þz£k•þy öî!¢ !Sé¡ ö¤ †þô ’þz£k•þyë%_« îéÝ!Øþöì†þ •þyþ› ¤éMéþy¡l †þîûöìîÐ xíÅyê ̃%!Øþ îéÝ þ›îûß›öìîûîû ôöìTMÄ •þyþ› ¤Méþy¡l †þöìîû ëyöìî ë•þÇþ” ly ̃%!Øþ îéÝ¥z ~†þ¥z ’þz£k•þyë%_« ¥ëûÐ 2Ìíô îéÝ!Øþ öî!¢ ’þz£k ¥Gëûyîû ?lÄ ö¤ ë•þØþy þ›!îûôy” •þyþ› î?Ål †þîûöìî !m•þ#ëû îéÝ!Øþ !‘þ†þ •þ•þØþy¥z •þyþ› @ýÌ¥” †þîûöìîÐ xíÅyê– ’þz£k•þîû îéÝ myîûy î!?Å•þ öôyØþ •þyþ› = ¢#•þ¡•þîû îéÝ myîûy ˆ,¥#•þ öôyØþ •þyþ›Ð TM!îû– P îéÝîû èþîû M gm P îéÝîû xyöìþ›!Çþ†þ •þyþ› s1 †þÄyöì¡y!îûù@ýÌyô °C P îéÝîû ’þz£k•þy t°1C xyîyîû– R îéÝîû èþîû m gm R îéÝîû xyöìþ›!Çþ†þ •þyþ› s2 †þÄyöì¡y!îûù@ýÌyô oC R îéÝîû ’þz£k•þy t°2C xyôîûy ?y!l– t1 > t2 P îéÝ •þyþ› î?Åöìlîû þ›îû G R îéÝ •þyþ› @ýÌ¥öì”îû þ›îû ’þz£k•þy ¥ëû t°CÐ \ P îéÝ myîûy î!?Å•þ •þyþ› (Q1) = M × s1 × (t1 – t)cal = Ms1(t1 – t) cal \ R îéÝ myîûy ˆ,¥#•þ •þyþ› (Q2) = m × s2 × (t – t2) cal = ms2(t – t2) cal \ †þÄyöì¡y!îû!ô!•þîû ô)¡l#!•þ xl%ëyëû#– Q1 = Q2 \ Ms1(t1 – t) = ms2(t – t2) TM!îû– •þyþ› @ýÌ¥” îy î?Åöìlîû ¤ôëû ö†þyöìly •þyþ› lÜT ¥ëû!lÐ 6.2.2 †þyëÅ G •þyöìþ›îû •%þ¡Ä•þy !îKþyl#îûy !î!èþ§¬ þ›îû#Çþy †þöìîû îöì¡öìSél öë †þyöìëÅîû ¤öìD •þyöìþ›îû ¤Á›†Åþ xyöìSéÐ †þyëÅöì†þ ‹þy¥zöì¡ •þyöìþ› îû*þ›yhsý!îû•þ †þîûy ëyëû îy •þyþ›öì†þ ‹þy¥zöì¡ †þyöìëÅ ¤Á›)”Åèþyöìî îû*þ›yhsý!îû•þ †þîûy ëyëûÐ öëôl韟Ÿ¥yöì•þîû •þy¡% ̃%!Øþöì†þ !†þS%éÇþ” ö ̃‡y ëyëû ‰£ìyîû þ›îû öë ¥yöì•þîû •þy¡% ˆîûô ¥öìëû öˆöìSéÐ ̃%!Øþ ¥yöì•þîû î¡ ~öì†þ xþ›öìîûîû Gþ›îû 2Ìöìëûyˆ †þöìîû ¤îû” ‰Øþyöìlyîû ?lÄ !†þS%é †þyëÅ ¥öìëû!Sé¡ ëy ~‡l •þyöìþ› þ›!îû”•þ ¥öìëûöìSéÐ xyîyîû !îþ›îû#•þ ! ̃öì†þ ~†þ!Øþ þ›ye !l¡yô •þyöì•þ !†þS%éØþy ?¡ èþ!•Åþ †þöìîû “þy†þly ¡y!ˆöìëû ’þzl%öìlîû ’þzþ›îû î!¤öìëû ! ̃¡yôÐ !†þS%éÇþ” ?¡ æ%þöìØþ ëyîyîû þ›îû þ›yöìeîû “þy†þly!Øþ l’þüy‹þ’þüy †þîûöì•þ Öîû& †þöìîûÐ ~îû öíöì†þ öîyVþy ëyëû öë †þyëÅ ¥öìFSéÐ †þyîû”– æ%þØþhsý ?¡ G îyÜ› þ›yöìeîû “þy†þly!Øþöì†þ l’þüöì•þ ¤y¥yëÄ †þîûöìSé ~î‚ •þyöìþ›îû myîûy ~‡yöìl †þyëÅ ¤Á›§¬ ¥öìFSéÐ !îKþyl# ?%¡ 2Ìôy” †þöìîû!Séöì¡l öë– ëy!sf†þ ¢!_«öì†þ ¤Á›)”Åèþyöìî •þyþ›¢!_«öì•þ þ›!îû”•þ †þîûy ëyëû ~î‚ ë•þØþy þ›!îûôy” ëy!sf†þ ¢!_«öì†þ îû*þ›yhsýîû †þîûy ¥ëû !‘þ†þ •þ•þØþy¥z •þyþ› ’þzêþ›§¬ ¥ëûÐ ¤Á›y! ̃•þ †þyöìëÅîû þ›!îûôy” myîûy ëy!sf†þ ¢!_«îû þ›!îûôyþ› †þîûy ¥ëûÐ xíÅyê ~îû öíöì†þ î¡y ëyëû öë !l! ̃ÅÜT þ›!îûôy” †þyëÅ ¥öì¡ ö¤¥z þ›!îûôy” •þyþ› ’þzêþ›§¬ ¥ëûÐ 6.2.3 ?%öì¡îû ¤)e: ë‡l ö†þyöìly †þyëÅ ¤Á›§¬ ¥îyîû æþöì¡ •þyþ› ’þzêþ›§¬ ¥ëû îy •þyþ›öì†þ †þyöìëÅ îû*þ›yhsýîû †þîûy ¥ëû •þ‡l †,þ•þ†þyöìëÅîû þ›!îûôy” G ’þzêþ›§¬ •þyþ› þ›îûß›öìîûîû ¤ôyl%þ›y!•þ†þ ¥ëûÐ ë! ̃– W þ›!îûôy” †þyöìëÅîû ?lÄ Q þ›!îûôy” •þyþ› ¤,!ÜT ¥ëû îy Q þ›!îûôy” •þyþ›öì†þ W þ›!îûôy” †þyöìëÅ îû*þ›yhsýîû †þîûy ¥ëû •þy¥öì¡ !îKþyl# ?%öì¡îû ô•þyl%ëyëû#–