Advertisements
Advertisements
Question
State factors on which the amount of heat radiated by a body depends.
Solution
The amount of heat radiated by a body depends on:
- The absolute temperature of the body (T)
- The nature of the body – the material, nature of the surface - polished or not, etc.
- The surface area of the body (A)
- Time duration for which body emits radiation (t).
APPEARS IN
RELATED QUESTIONS
A refrigerator converts 100 g of water at 20°C to ice at -10°C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.
Given: Specific heat capacity of ice = 2.1 J g-1°C-1
Specific heat capacity of water = 4.2 J g-1°C-1
Specific latent heat of fusion of ice = 336 J g-1
During the phase change does the average kinetic energy of the molecules of the substance increase?
Write the expression for the heat energy Q received by the substance when m kg of substance of specific heat capacity c Jkg-1 k-1 is heated through Δt° C.
Two metallic blocks P and Q of masses in ratio 2: 1 are given the same amount of heat. If their temperature rise by the same amount, compare their specific heat capacities.
Explain the term boiling point ?
Why do bottled soft drinks get cooled, more quickly by the ice cubes than by the iced water, both at 0℃?
It is generally cold after a hail-storm then during and before the hail storm. Give reason.
Name the radiations for which the green house gases are transparent ?
Solve the following problems:
Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3°C and B by 5°C. Which object has more specific heat? And by what factor?
What is the specific heat capacity of boiling water?
What is the unit of heat capacity in CGS system?
(b) 2000 J of heat energy is required to raise the temperature of 4 kg of a
metal by 3°c. Which expression gives the specific heat capacity of the metal?
A solid of mass 80 g at 80°C is dropped in 400 g water at 10°C. If final temp. is 30°C, find the sp. heat cap. of the solid.
What is heat? What is the S. I. unit of heat?
What are other units of heat? Name and define them.
Write two advantages of high specific heat capacity of water.
Explain, why do sandy soils, get heated up quickly as compared to wet soils?
Explain, why does a wise farmer water his fields, if forecast is forst?
Why are athletes advised to put on extra clothes after competing on event?
The temperature of a lead piece of mass 400 g rises from 20°C to 50°C when 1560 J of heat is supplied to it. Calculate Specific heat capacity of lead.
A. hot solid of mass 60 g at 100°C is placed in 150 g of water at 20° C. The final steady temperature recorded is 25°C. Calculate the specific heat capacity of the solid. [Specific heat capacity of water = 4200 J kg-1 °C-1]
The heat capacity of the vessel of mass 100 kg is 8000 J/°K. Find its specific heat capacity.
50 g of copper is heated to increase its temperature by 10° C. If the same quantity of heat is given to 5 g water, the rise in its temperature is [Specific heat of copper = 420 joule-kg-1 °C-1 , specific heat of water = 4200 joule-kg-I °C-1]
A monoatomic gas of pressure 'P' having volume 'V' expands isothermally to a volume '2V' and then adiabatically to a volume '16V'. The final pressure of the gas is ______.
(ratio of specific heats = `5/3`)
Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.
Two cylinders of equal height and radius are made of copper and aluminum. Which of them conducts heat faster?
Which of the following substances (A, B and C) has the highest specific heat?
When two kilocalories of heat are supplied to a system, the internal energy of the system increases by 5030 J and the work done by the gas against the external pressure is 3350 J. Calculate J, the mechanical equivalent of heat.
