An ideal Black-body at room temperature is thrown into a furnace. It is observed thatA. initially it is the darkest body and later the brightestB. it is the darkest body at all timesC. it cannot be distinguished at all timesD. initially it is the darkest body and later it cannot be distinguished

An ideal Black-body at room temperature is thrown into a furnace. It i

1.	An ideal Black-body at room temperature is thrown into a furnace. It is observed thatA. initially it is the darkest body and later the brightestB. it is the darkest body at all timesC. it cannot be distinguished at all timesD. initially it is the darkest body and later it cannot be distinguished
Answer» Correct Answer - A When the temperature of black body becomes equal to the temperature of furnace, it will radiate maximum energy, so it will be brightest. Initially it will absorb all radiations, so it will be darkest.

Discussion

No Comment Found

Related InterviewSolutions

Starting with the same initial conditions, an ideal gas expands from volume `V_1` to `V_2` in three different ways, the work done by the gas is `W_1` if the process is purely isothermal, `W_2` if purely isobaric and `W_3` if purely adiabatic, thenA. `W_2gtW_1gtW_3`B. `W_2gtW_3gtW_1`C. `W_1gtW_2gtW_3`D. `W_1gtW_3gtW_2`
5.6 liter of helium gas at STP is adiabatically compressed to 0.7 liter. Taking the initial temperature to be `T_1,` the work done in the process isA. `9/8RT_1`B. `3/2RT_1`C. `15/8RT_1`D. `9/2RT_1`
Calorie is defined as the amount of heat required to raise temperature of 1 g of water by `1^@C` and it is defined under which of the following conditions?A. From `14.5^@C` to `15.5^@C` at 760 mm of HgB. From `98.5^@C` to `99.5^@C` at 760 mm of HgC. From `13.5^@C` to `14.5^@C` at 76 mm of HgD. From `3.5^@C` to `4.5^@C` at 76 mm of Hg
In which of the following process, convection does not take place primarilyA. sea and land breezeB. boiling of waterC. heating air around a furnaceD. warning of glass of bulb due to filament
Earth receives `1400 W//m^2` of solar power. If all the solar energy falling on a lens of area `0.2m^2` is focused on to a block of ice of mass 280 grams, the time taken to melt the ice will be….. Minutes. (`Latent heat of fusion of ice`=`3.3xx10^5J//kg`.)
The figure below shows the variation of specific heat capacity (C) of a solid as a function of temperature (T). The temperature is increased continuously form 0 to 500K at a constant rate. Ignoring any volume change, the following statement (s) is (are) correct to a reasonable approximation. A. the rate at which heat is absorbed in the range 0-100K varies linearly with temperature T.B. heat absorbed in increasing the temperature from 0-100K is less than the heat required for increasing the temperature from 400-500K.C. there is no change in the rate of heat absorption in range 400-500K.D. the rate of heat absorption increases in the range 200-300K.
During an experiment, an ideal gas is found to obey an additional law `VP^2=constant,` The gas is initially at a temperature T, and volume V. When it expands to a volume `2V,` the temperature becomes…….
Two non-reactive monoatomic ideal gases have their atomic masses in the ratio `2:3.` The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is `4:3.` The ratio of their densities isA. `1:4`B. `1:2`C. `6:9`D. `8:9`
An ideal gas is taken through the cycle `AtoBtoCtoA,` as shown in the figure, If the net heat supplied to the gas in the cycle is 5J, the work done by the gas in the process CtoA is A. `-5J`B. `-10J`C. `-15J`D. `-20J`
An ideal monoatomic gas is taken round the cycle ABCDA as shown in the P-V diagram. The work done during the cycle is A. `PV`B. `2PV`C. `1//2`D. zero

An ideal Black-body at room temperature is thrown into a furnace. It is observed thatA. initially it is the darkest body and later the brightestB. it is the darkest body at all timesC. it cannot be distinguished at all timesD. initially it is the darkest body and later it cannot be distinguished

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment