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When the temperature of a copper coin is...

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

Coefficient of linear expansion of copper is `0.25xx10^(-4)//^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
ACD
`(DeltaA)/(A)xx100=2((Deltal)/(l))xx100rArr%"increase in area"=2xx0.2=0`
As `Deltal=lalphaDeltaT`
`(Deltal)/(l)xx100=alphaDeltaTxx100=0.2%rArralpha=0.25xx10^(-4)//^(@)C`
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