The temperature of the body is increased from $-73^o C\, to \,327^o C$, the ratio of energy emitted per second is :
AIIMS 2016, Medium
Download our app for free and get started
${T_1} = - 73 + 273 = 200K$
${T_2} = 327 + 273 = 600\;K$
Energy per second $P\left( { = \frac{Q}{t}} \right) \propto {T^4}$
$\Rightarrow \frac{{{P_2}}}{{{P_1}}} = {\left( {\frac{{{T_2}}}{{{T_1}}}} \right)^4} = {\left( {\frac{{600}}{{200}}} \right)^2} = 81$
$\frac{{{P_1}}}{{{P_2}}} = \frac{1}{{81}}$
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature ${120^o}C$, thenView Solution
- 2A body cools from $80^{\circ}\,C$ to $60^{\circ}\,C$ in $5$ minutes. The temperature of the surrounding is $20^{\circ} C$. The time it takes to cool from $60^{\circ}\,C$ to $40^{\circ}\,C$ is........... $s$View Solution
- 3View SolutionFor proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass
- 4Assume that Solar constant is $1.4 \,kW / m ^2$, radius of sun is $7 \times 10^5 \,km$ and the distance of earth from centre of sun is $1.5 \times 10^{8} \,km$. Stefan's constant is $5.67 \times 10^{-6} \,Wm ^{-2} K ^{-4}$, find the approximate temperature of sun ....... $K$View Solution
- 5Shown below are the black body radiation curves at temperatures $T1$ and $T2$ (T2>T1). Which of the following plots is correctView Solution
- 6If two metallic plates of equal thicknesses and thermal conductivities ${K_1}$ and ${K_2}$ are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will beView Solution
- 7If $\lambda_{ m }$ denotes the wavelength at which the radioactive emission from a black body at a temperature $T \;K$ is maximum, thenView Solution
- 8Two rectangular blocks, having indentical dimensions, can be arranged either in configuration $I$ or in configuration $II$ as shown in the figure, On of the blocks has thermal conductivity $k$ and the other $2 \ k$. The temperature difference between the ends along the $x$-axis is the same in both the configurations. It takes $9\ s$ to transport a certain amount of heat from the hot end to the cold end in the configuration $I$. The time to transport the same amount of heat in the configuration $II$ is :View Solution
- 9If a graph is plotted by taking spectral emissive power along $y$-axis and wavelength along $x$-axis then the area below the graph above wavelength axis is ...........View Solution
- 10A slab of stone of area $0.36\;m ^2$ and thickness $0.1 \;m$ is exposed on the lower surface to steam at $100^{\circ} C$. A block of ice at $0^{\circ} C$ rests on the upper surface of the slab. In one hour $4.8\; kg$ of ice is melted. The thermal conductivity of slab is .......... $J / m / s /{ }^{\circ} C$ (Given latent heat of fusion of ice $=3.36 \times 10^5\; J kg ^{-1}$)View Solution