A metallic sphere with a radius of and emissivity is heated to a temperature . If the absolute temperature of the surroundings is , which of the following expressions correctly represents the net rate of heat loss by radiation from the sphere?
Related Questions
In a water-fall the water falls from a height of 100m. If the entire K.E. of water is converted into heat, the rise in temperature of water will be
Two bodies A and B are in thermal equilibrium with a third body C. Which of the following statements is TRUE according to the Zeroth Law of Thermodynamics?
A and B are in thermal equilibrium with each other.
A and B have the same temperature as C, but not necessarily with each other.
A and B transfer heat to C.
C transfers heat to both A and B.
Which of the following the scalar quantity is
Temperature
Moment of inertia
Moment of couple
Magnetic moment
If object A is in thermal equilibrium with object B, and object B is in thermal equilibrium with object C, what can be said about the temperatures of objects A and C?
The temperature of A is higher than C.
The temperature of C is higher than A.
They are the same.
There is not enough information to determine.
Heat always flows from:
A lower temperature to a higher temperature
A higher temperature to a lower temperature
A larger object to a smaller object
A denser object to a less dense object
An electric immersion heater of 1.08 kW is immersed in water. After the water has reached a temperature of , how much time will be required to produce 100 g of steam
210 s
105 s
420 s
50 s
Which of the following is the best example of the Zeroth Law of Thermodynamics?
Heat flows from a hotter body to a colder body.
If two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.
Energy can neither be created nor destroyed, only transferred or changed from one form to another.
It is impossible to reach absolute zero in a finite number of steps.
A solid sphere and a hollow sphere of the same material and radius are heated to the same temperature and allowed to cool in the same environment. Which sphere will have a higher initial rate of cooling?
Solid sphere
Hollow sphere
Both will cool at the same rate
Insufficient information
Temperature is a measure of:
The total energy of the molecules in a substance
The average kinetic energy of the molecules in a substance
The potential energy of the molecules in a substance
The heat capacity of a substance
