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Short Questions. What is Conduction? Explain the process and write down it usage in our daily life. On what factors conduction of heat depend? And define thermal conductivity. Write down tbe uses of conductors and non-conductors. What is convection? Explain the process. What do you know about convection currents in Air? How land and sea breeze blow?
Define Radiation. How does heat reach us from the sun? Explain Radiation. What is Leslie cube? How various surfaces can be compared by Leslie cube? Explain the application and consequences of Radiations.
Long Questions with Answers in the Below Images. MCQS 1. In solids, heat is transferred by:. What happens to the thermal conductivity of a wall if its thickness is doubled? The land breeze blows from: 9. Which of the following is a good radiator of heat? Styrofoam is a: Recommend Documents. Test Form A Chapter 4 - dysoncentralne. How many more victories did the 8th grade basketball team have than the 10th Chapter Test B.
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Energy is transferred as heat from the higher-energy particles to the lower-energy particles through collisions of the higher with the lower energy particles. The ice begins to melt and change into water. Thermal conduction is the process by which energy is transferred as heat through a material between two points at different temperatures. The atoms of the hotter substance lose energy and the atoms of the cooler substance gain energy. Hypothermia is the transfer of too much energy from the human body to the surrounding air so that body temperature falls below normal levels.
Covering the body would protect it from direct sunlight and prevent excessive loss of body water through evaporation. The temperature increases because temperature is proportional to kinetic energy of the molecules.PDFGetting the screenshots prepared is a good approach that might time savings.
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News Main Picture Stories Interviews. Colleges and Universities Featured Listing of Colleges. Colleges by Cities Colleges by Levels. Study Abroad Consultants Register as consultant. Start Unit 9 Test. Unit 1. Unit 2. Unit 3. Unit 4. Unit 5. Unit 6. Unit 7. Unit 8. Unit 9. Start Physics Unit 9 Test.Holt McDougal publishes solution manuals to many of their textbooks, including Physics, which can be purchased directly from their website.
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Home World View. What Are the U. Citizenship Questions? What Are Examples of Instructional Materials?Why are metals good conductors of heat?
Answer :. Metals are good conductors of heat because metal contains free electrons which can move from one place to another, by getting energy. At the hot end, they get energy from the hot flame and move toward cold end, transferring energy to the other atoms and electron by collision on their way.
At the same time atoms at the hot end, start vibrating more vigorously and transfer some energy by collision to neighboring atoms, eventually heating the other end. Why conduction of heat does not take place in gases? Conduction is the process of transfer of heat by vibrating atoms and free electrons in solids from hotter to colder parts of the body while convection is the process of transfer of heat by actual movement of molecules from hot place to cold place.
So in the gases, molecules do not vibrate at their places, due to weak intermolecular forces, the molecules actually move from their places. What measures do you suggest to conserve energy in houses? Why does transfer of heat in fluids take place by convection?
Convection is a process of transfer of heat by actual movement of molecules from hot place to a cold place.
As we know the intermolecular forces are less in fluids as compared to solid, due to weak intermolecular forces the fluids molecules can move from their actual positions and are responsible for the transfer of heat by convection process.
What is meant by convection current? The path flow or current which is used for the transfer of heat by actual movement of molecules for hot place to a cold place is known as convection current. Suggest a simple activity to show convection of heat in gases not given in the book. An example of convection in daily life is when we use a fire place to heat our home, as the fire heats up the air in front of it, the hot air rises up as it is less dense and than in turn pushes the cool air down so that it is heated and then rises, this motion is called convection currents and is the reason why fire place air effective to heat us.
How does heat reach us from the Sun? Heat reaches us from the sun through radiation process. How various surfaces can be compared by a Leslie cube? What is greenhouse effect? In the environment, carbon dioxide and water also behave in a similar way to radiations as glass or polythene.