A black body is heated from $7\,^oC$ to $287\,^oC$. The ratio of radiation emitted is
$1.256$
$1.27$
$1.16$
$1.64$
$\frac{E_{1}}{E_{2}}=\left(\frac{280}{560}\right)^{4}=\frac{1}{16}$
The maximum energy in the thermal radiation from a hot source occurs at a wavelength of $11 \times 10^{-5}\, cm$ . According to Wien's law, the temperature of the source (on kelvin scale) will be $n$ times the temperature of another source (on Kelvin scale) for which the wavelength at maximum energy is $5.5 \times 10^{-5}\, cm$ . The value of $n$ is
A black body at $1227\,^oC$ emits radiations with maximum intensity at a wavelength of $5000\,\mathop A\limits^o $ . If the temperature of the body is increased by $1000\,^oC,$ the maximum intensity will be at ……. $\mathop A\limits^o $
Six identical conducting rods are joined as shown in figure. Points $A$ and $D$ are maintained at temperatures $200\,^oC$ and $20\,^oC$, respectively. the temperature of junction $B$ will be …….. $^oC$
A body cools from $62\,^oC$ to $50\,^oC$ in $10\, minutes$ and to $42\,^oC$ is next $10\, minutes$. The temp. of surrounding is …….. $^oC$
A black body, at a temperature of $227\,^oC$ radiates heat at a rate of $7\, cal\, cm^{-2} \,s^{-1}$. At a temperature of $727\,^oC$, the rate of heat radiated in the same $units$ will be ….. $unit$
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