On a cold morning, a metal surface will feel colder to touch than a wooden surface because
AIIMS 1998, Easy
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Heat passes quickly from the body into the metal which leads to a cold feeling.
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One end of a copper rod of length $1.0\;m$ and area of cross-section ${10^{ - 3}}$ is immersed in boiling water and the other end in ice. If the coefficient of thermal conductivity of copper is $92\;cal/m{\rm{ - }}s{{\rm{ - }}^o}C$ and the latent heat of ice is $8 \times {10^4}cal/kg$, then the amount of ice which will melt in one minute is
A body cools from a temperature $3T$ to $2T$ in $10$ minutes. The room temperature is $T.$ Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next $10$ minutes will be
What will be the ratio of temperatures of sun and moon if the wavelengths of their maximum emission radiations rates are $140 Å$ and $4200 Å$ respectively
Two sphere of radius $R_1$ and $R_2$ have densities ${\rho _1}$ and ${\rho _2}$ and specific heat $S_1$ and $S_2$ if they are heated to the same temperature the ratio of their rates of falling temperature will be
A metal ball of surface area $200\;c{m^2}$ and temperature ${527^o}C$ is surrounded by a vessel at ${27^o}C$. If the emissivity of the metal is $0.4$ , then the rate of loss of heat from the ball is .......... $joules $ approx. $(\sigma = 5.67 \times {10^{ - 8}}J/{m^2}\; - s - {k^4})$