Two models of a windowpane are made, two identical glass panes of thickness `3 mm` are separated with an air gap of `3mm`. This composite system is fixed in the window of a room. The other model consists of a single glass pane of thickness `6mm`, the temperature difference being the same as for first model. the ratio of the heat flow for the double pane to that for the single pane is `(K_("glass") = 2.5 xx 10^(-4) cal//s.m.^(@)C` and `K_("air") = 6.2 xx 10^(-6)cal//s.m.^(@)C)`

Two models of a windowpane are made. In one model, two identical glass panes of thickness 3 mm are separated with an air gap of 3 mm. This composite system is fixed in the window of a room The other model consist of a single glass pane of thickness 3 mm, the temperature difference being the same as for the first model. the ratio of the heat flow fot the double pane to that for the single pane is ( K_("glass")=2.5 xx10^(-4)cal//s.m.^(@)C and K_("air")=6.2 xx10^(-6)cal//s.m.^(@)C ).

Two models of a windowpane are made. In one model, two identical glass panes of thickness 3 mm are separated with an air gap of 3 mm. This composite system is fixed in the window of a room The other model consist of a single glass pane of thickness 3 mm, the temperature difference being the same as for the first model. the ratio of the heat flow fot the double pane to that for the single pane is ( K_("glass")=2.5 xx10^(-4)cal//s.m.^(@)C and K_("air")=6.2 xx10^(-6)cal//s.m.^(@)C ).

The time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is

Why the window glass panes of the old buildings are thick at the bottom ?

The time taken by the light to cross a glass of thickness 4 mm and refractive index (mu = 3) , will be

The area of a glass window is 1.2 m^(2) . The thickness of the glass is 2.2 mm. If the temperature outside is 36°C and the temperature inside is 26°, calculate the heat flowing into the room every hour. Thermal conductivity of glass is 0.8 Wm^(-1) K^(-1) .

Why does the inner side of a window pane in a room sweat in cold weather?

What is the time taken (in seconds ) to cross a glass of thickness 4 mm and mu= 3 by light