Write whether the following statement is true or false: If coefficient of linear expansion of iron is 1.2 × 10⁻⁵ /°C then coefficient of cubical expansion of iron is 3.6 × 10⁻⁵ /°C.
Or
Which physical quantity has the unit W m⁻¹ K⁻¹?
WBBSE
Class X
Physical Science
Thermal phenomena
01 Mark
2025
True
Explanation:
Coefficient of cubical expansion γ = 3 × coefficient of linear expansion α (for isotropic solids like iron)
or
Thermal conductivity
Explanation:
Thermal conductivity k has unit W m⁻¹ K⁻¹, measuring heat conduction rate through material.
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