In the rainy season,on a clear night,the black seat of a bicycle becomes wet because:

The absorption coefficient of an open window is:

If a black body at $400 \ K$ surrounded by atmosphere at $300 \ K$ has a rate of cooling '$R_0$',the same body at $900 \ K$,surrounded by the same atmosphere,will have a rate of cooling nearly:

For a perfectly black body,the coefficient of emission (emissivity) is:

Why are the bottom layers of cooking vessels kept black in color?

The following figure shows two air-filled bulbs connected by a $U$-tube partly filled with alcohol. One bulb is painted black and the other is painted white (or silver/shiny). What happens to the levels of alcohol in the limbs $X$ and $Y$ when an electric bulb placed midway between the two bulbs is lighted?