1.

Whatis meant byspecificheat capacity ? Howwill proveexperimentallythat differentsubstancehave different speificheatcapacities?

Answer»

SOLUTION :(i) The quantity of heatenergyrequiredto raise a temperatureofunit massofa substancethrough`1^(@)C`is calledspeificheatcapacity of a substance.
(II) Three soildspheres of equal massesof materialiron,copperand lead are placedin boilingwaterfor same time.Afterremovingthensimultaneously,they are palcedon the wax trytogether .
(iii) THESPHERE whichabsrobsmore heatcanmeltmorewax .
(IV) Ironsphere meltsmorewaxand goesdeep into itray. Theleadsphere goes less deepinto themoltenwax. Thecoppersphere goes tointermediatedepth.
(v) Thisindicatesthatthe heatabsorbed bydifferentmaterialdiffers. Theis specificheatcapacityof metals .
(vi) Spefifcheatcapacityis denoted byletter 'c' . InCGSit is measured in `cal//g^(@)C`, whilein MKS , it ismeasuredin `j//kg^(@)C` .


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