Transfer Of Thermal Energy
Akopọ
A metal spoon in a hot drink soon burns your fingers, yet a wooden spoon stays cool. Warm air rises from a radiator to heat a whole room, and the Sun's warmth crosses the empty vacuum of space to reach us. These are the three ways thermal energy moves: conduction, convection and radiation.
In this topic you will describe experiments that reveal good and bad conductors, explain convection in terms of density changes, and learn how surface colour and texture affect infrared radiation. You will also see why an object stays at a steady temperature only when energy in balances energy out, and how that same balance controls the temperature of the Earth.
Awọn Afojusun
- Describe experiments to demonstrate the properties of good thermal conductors and bad thermal conductors (thermal insulators)
- Know that convection is an important method of thermal energy transfer in liquids and gases
- Explain convection in liquids and gases in terms of density changes and describe experiments to illustrate convection
- Know that thermal radiation is infrared radiation and that all objects emit this radiation
- Know that thermal energy transfer by thermal radiation does not require a medium
- Describe the effect of surface colour (black or white) and texture (dull or shiny) on the emission, absorption and reflection of infrared radiation
- [Supplement] Describe thermal conduction in all solids in terms of atomic or molecular lattice vibrations and also in terms of the movement of free (delocalised) electrons in metallic conductors
- [Supplement] Describe, in terms of particles, why thermal conduction is bad in gases and most liquids
- [Supplement] Know that there are many solids that conduct thermal energy better than thermal insulators but do so less well than good thermal conductors
- [Supplement] Know that for an object to be at a constant temperature it needs to transfer energy away from the object at the same rate that it receives energy
- [Supplement] Know what happens to an object if the rate at which it receives energy is less or more than the rate at which it transfers energy away from the object
- [Supplement] Know how the temperature of the Earth is affected by factors controlling the balance between incoming radiation and radiation emitted from the Earth’s surface
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Transfer Of Thermal Energy. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which method of thermal energy transfer can occur through a vacuum? A. conduction B. convection C. radiation D. none of these Answer: C
- Metals are good thermal conductors mainly because they contain: A. large atoms B. free electrons C. trapped air D. water Answer: B
- Warm fluid rises in convection because it becomes: A. denser B. less dense C. heavier D. solid Answer: B
- Which surface is the best emitter of infrared radiation? A. shiny silver B. polished white C. dull black D. shiny white Answer: C
- For an object to stay at a constant temperature, the energy it receives must be: A. greater than energy lost B. equal to energy lost C. less than energy lost D. zero Answer: B
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Transfer Of Thermal Energy? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
Ṣe igbasilẹ ohun elo naa lori Google Playstore
Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
