A steel tape gives correct measurement at 20° C. A piece of wood is being measured with the steel tape at 0° C. The reading is 25 . cm on the tape, the real length of the given piece of wood must be :

Question

A steel tape gives correct measurement at 20° C. A piece of wood is being measured with the steel tape at 0° C. The reading is 25 . cm on the tape, the real length of the given piece of wood must be : (A) 25 cm (B) < 25 cm (C) > 25 cm (D) can not say

Tardigrade Admin · Accepted Answer

(Δ L / L )=α Δ t =-α 20 means read more so actual is less

Q. A steel tape gives correct measurement at $2 0^{\circ} C$ . A piece of wood is being measured with the steel tape at $0^{\circ} C$ . The reading is $25 . c m$ on the tape, the real length of the given piece of wood must be :

25 cm

< 25 cm

> 25 cm

can not say

$\frac{Δ L}{L} = α Δ t = - α 20$
means read more so actual is less

Q. A steel tape gives correct measurement at 20∘C. A piece of wood is being measured with the steel tape at 0∘C. The reading is 25.cm on the tape, the real length of the given piece of wood must be :