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A black body calorimeter filled with hot water cools from $60^o C$ to $50^o C$ in $4 \,\,min$ and $40^o C$ to $30^o C$ in $8 \,\min$. The approximate temperature of surrounding is ........ $^oC$
The wavelength of maximum energy released during an atomic explosion was $2.93 \times {10^{ - 10}}m$. Given that Wein's constant is $2.93 \times {10^{ - 3}}m - K$, the maximum temperature attained must be of the order of
A particular star (assuming it as a black body) has a surface temperature of about $5 \times {10^4}K.$The wavelength in nanometers at which its radiation becomes maximum is $(b = 0.0029 mK)$
A planet of radius $R_{p}$ is revolving around a star of radius $R^{*}$, which is at temperature $T^{*}$. The distance between the star and the planet is $d$. If the planet's temperature is $f T^{*}$, then $f$ is proportional to
A metallic rod of cross-sectional area $9.0\,\,cm^2$ and length $0.54 \,\,m$, with the surface insulated to prevent heat loss, has one end immersed in boiling water and the other in ice-water mixture. The heat conducted through the rod melts the ice at the rate of $1 \,\,gm$ for every $33 \,\,sec$. The thermal conductivity of the rod is ....... $ Wm^{-1} K^{-1}$
Consider two hot bodies ${B_1}$ and ${B_2}$ which have temperatures ${100^o}C$ and ${80^o}C$ respectively at $t = 0$. The temperature of the surroundings is ${40^o}C$. The ratio of the respective rates of cooling ${R_1}$ and ${R_2}$ of these two bodies at $t = 0$ will be