A glass window is to be fit in an aluminium frame. The temperature on the working day is 40°c and the glass window measures exactly 20 cm xx 30cm. [ alpha_("glass") = 9 xx 10^(-6)//^(@) C, alpha_("aluminium") = 24 xx 10^(-6)//^(@) C]. The size of the aluminium frame is _. so that there is no stress on the glass in winter even if the temperature drops to 0^(@) C?

A glass window is to be fit in an aluminium frame. The temperature on

1.	A glass window is to be fit in an aluminium frame. The temperature on the working day is 40°c and the glass window measures exactly 20 cm xx 30cm. [ alpha_("glass") = 9 xx 10^(-6)//^(@) C, alpha_("aluminium") = 24 xx 10^(-6)//^(@) C]. The size of the aluminium frame is _. so that there is no stress on the glass in winter even if the temperature drops to 0^(@) C?
Answer» `20.012 cm XX 30.01 cm` `10 cm xx 20 cm` `30 cm xx 20 cm` `15 cm xx 30 cm` Answer :A