When the temperature of a copper coin is raised by `80^@C`, its diameter increases by `0.2%`.A. percentage rise in the area of a face is `0.4%`B. percentage rise in the thickness is `0.4%`C. percentage rise in the volume is `0.6%`D. corfficient of linear expansion of copper is `0.25xx10^(-4)//^(@)C`

When the temperature of a copper coin is raised by `80^@C`, its diamet

1.	When the temperature of a copper coin is raised by `80^@C`, its diameter increases by `0.2%`.A. percentage rise in the area of a face is `0.4%`B. percentage rise in the thickness is `0.4%`C. percentage rise in the volume is `0.6%`D. corfficient of linear expansion of copper is `0.25xx10^(-4)//^(@)C`
Answer» Correct Answer - A::C::D `(DeltaA)/(A)xx100=2((Deltal)/(A))xx100` `%` increase in area`=2xx0.2=0.4` `(DeltaV)/(V)xx100=3xx0.2=0.6%` Since `DeltaI=IalphaDeltaT` `(Deltal)/(l)xx100=alphaDeltaTxx100=0.2` `alpha=0.25xx(10^-4^@)/(C )`

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