If the absorptance and reflectance of a surface are $0.4$ and $0.6$ respectively,then:

$A$ body has a transmission power of $1/6$ and a reflection power of $1/3$. Find its absorption power.

Three very large plates of the same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures $2\ T$ and $3\ T$ respectively. The temperature of the middle (i.e.,second) plate under steady-state condition is

The surface of a thermos flask is kept shiny because:

Define thermal radiation and radiant energy and explain Prevost's theory of heat exchange.

When the bulb is switched on,what happens to the level of alcohol on the $X$ side?