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When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in temperature, at a constant pressure is :
10
Sep
When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in temperature, at a constant pressure is : at a constant pressure is : at constant volume its temperature increases by ΔT. The heat required to produce [...]
A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20 C is :
10
Sep
A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20 C is : A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas [...]
Two materials having coefficients of thermal conductivity ′ 3K ′ and ′ K ′ and thickness ‘d’ and ′ 3d ′ , respectively, are joined to form a slab as shown in the figure. The temperature of the outer surfaces are ′ θ2 ′ and ′ θ1 ′ respectively, (θ2 > θ1 ). The temperature at the interface is?
10
Sep
Two materials having coefficients of thermal conductivity ′ 3K ′ and ′ K ′ and thickness ‘d’ and ′ 3d ′ , respectively, are joined to form a slab as shown in the figure. The temperature of the outer surfaces are ′ θ2 ′ and ′ θ1 ′ respectively, (θ2 > θ1 ). The [...]
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(θ2 > θ1 ). The temperature at the interface is? ,
are joined to form a slab as shown in the figure. The temperature of the outer surfaces are ′ θ2 ′ and ′ θ1 ′ respectively ,
respectively ,
Two materials having coefficients of thermal conductivity ′ 3K ′ and ′ K ′ and thickness 'd' and ′ 3d ′ ,
The figure shows two process A and B for a gas. If ΔQ A and ΔQB are the amount of heat absorbed by the system in two cases. and ΔUA and ΔUB are changes in internal energies, respectively, then:
10
Sep
The figure shows two process A and B for a gas. If ΔQ A and ΔQB are the amount of heat absorbed by the system in two cases. and ΔUA and ΔUB are changes in internal energies, respectively, then: respectively The figure shows two process A and B for a gas. If ΔQ [...]
The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by :
10
Sep
The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by : in the same order is given by : isobaric isochoric isothermal and adiabatic. The correct assignment of the processes The given diagram shows four processes i.e. September 10, 2021 [...]
A thermally insulated vessel contains 150g of water at 0 C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0 C itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water = 2.10×10^6 J kg^−1 and Latent heat of Fusion of water =3.36×10^5 J kg^−1 )
10
Sep
A thermally insulated vessel contains 150g of water at 0 C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0 C itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water = 2.10×10^6 J kg^−1 [...]
Three discs A,B and C having radii 2m,4m, and 6m respectively are coated with carbon black on their outer surfaces. The wavelength corresponding to maximum intensity are 300nm,400nm and 500nm respectively. The power radiated by them are QA , QB and QC respectively.
10
Sep
Three discs A,B and C having radii 2m,4m, and 6m respectively are coated with carbon black on their outer surfaces. The wavelength corresponding to maximum intensity are 300nm,400nm and 500nm respectively. The power radiated by them are QA , QB and QC respectively. 400nm and 500nm respectively. The power radiated by them are QA 4m [...]
A heated body emits radiation which has maximum intensity near the frequency vo. The emissivity of the material is 0.5. If the absolute temperature of the body is doubled. Then :
10
Sep
A heated body emits radiation which has maximum intensity near the frequency vo. The emissivity of the material is 0.5. If the absolute temperature of the body is doubled. Then : A heated body emits radiation which has maximum intensity near the frequency vo. The emissivity of the material is 0.5. If the absolute temperature [...]
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 34λ0 , the power radiated by it will increases by a factor of
10
Sep
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 34λ0 , the power radiated by it will increases by a factor of The power radiated by a black body [...]
The plots of intensity versus wavelength for three black bodies at temperatures T1 ,T2 and T3 respectively are shown in fig. Their temperatures are such that:
10
Sep
The plots of intensity versus wavelength for three black bodies at temperatures T1 ,T2 and T3 respectively are shown in fig. Their temperatures are such that: T2 and T3 respectively are shown in fig. Their temperatures are such that: The plots of intensity versus wavelength for three black bodies at [...]