Emissive Power and Absorptive Power

Define the coefficient of the emission.

Which of the following factors on which emissive power of a body depends?

Half part of ice block is covered with black cloth and rest half is covered with white cloth and then it is kept in sunlight. After some time clothes are removed to see the melted ice. Which of the following statements is correct ?

The spectra of a black body at temperature $327 °\mathrm{C}$ and $627 °\mathrm{C}$ are shown in figure. If $A_{1 }$ and $A_2$ be the areas under the two curves respectively, the value of $A_2/A_1$ is :-

The spectrum of a black body at two temperatures $27 °\mathrm{C}$ and $327 °\mathrm{C}$ is shown in the figure. Let  $A_1$ and $A_2$ be the areas under the two curves respectively. Find the value of $A_2/A_1$.

When $\mathrm{p}$ calories of heat is given to a body, it absorbs $\mathrm{q}$ calories. Then the absorption power of body will be

A body with area $A$ and temperature $T$ and emissivity $e=0.6$ is kept inside a spherical black body. What will be the maximum energy radiated?

A polished surface,

Assertion: A body that is a good radiator is also a good absorber of radiation at a given wavelength.

Reason: According to Kirchoff's law, the absorptive power of a body is equal to its emissivity at a given wavelength.

Assertion: A body that is a good radiator is also a good absorber of radiation at a given wavelength.

Reason: According to Kirchoff's law, the absorptivity of a body is equal to its emissivity at a given wavelength.

Half part of ice block is covered with black cloth and rest half is covered with white cloth and then it is kept in sunlight. After some time clothes are removed to see the melted ice. Which of the following statements is correct ?

A polished metal plate, with a rough black spot on it, is heated to about $1400 \mathrm{K}$ and quickly taken to a dark room. The spot will appear,

$150 \mathrm{J}$ of energy is incident on area $2 {\mathrm{m}}^2$. If $Q_r= 15 \mathrm{J},$ coefficient of absorption is $0.6$, then the amount of energy transmitted is

When the temperature of a black body increases, it is observed that the wavelength corresponding of maximum energy changes from $0.26 \mathrm{\mu m}$ to $0.13 \mathrm{\mu m}$. The ratio of power emitted by the body at the respective temperature is

The graph, shown in the diagram, represents the variation of temperature ($T$) of the bodies, $x$ and $y$ having the same surface area, with time ($t$) due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies
 

An ideal black- body at room temperature is thrown into a furnace. It is observed that