Unit 1a Flashcards
What is heat energy represented as in a wavelength
Infrared (IR) radiation
True or false: the smaller the temperature difference between a body and its surroundings the faster the heat energy transfer with its surroundings.
False it is the greater the temperature difference between a body and its surroundings
True or false: objects always emit (IR) Radiation
True the warmer an object is the grater amount of infrared radiation it emits
Why are solar hot water panels painted mat black
Because a mat black surface is the most effective colour at absorbing infrared radiation. The opposite of a reflective mirror like surface which reflects the (IR) radiation.
Describe the movement and arrangement of atoms in a solid
A solid is a static arrangement of atoms in which they are ordered in rows upon rows resulting in them being relatively stable and unlikely to move
Describe the arrangement and movement of particles in a liquid
A liquid is a fluid arrangement of atoms with weak forces of attraction between the atoms allowing the atoms to say close together, but can move past one another to form irregular arrangements.
Describe the arrangement and movement of gas particles
Gasses have next to no forces of attraction between atoms. They move in random directions due to their high energy levels and also due to their ability to move freely
What is the name of the process where vibrating particles pass on their extra kinetic energy to neighbouring particles.
This is known as conduction, where the energy acquired form heat (IR) is passed on through the atoms in the for of Kinetic energy
What type of heat transfer cannot take please in a solid.
Convection. This can only happen in gasses and liquids because it is the recycling of heat energy though the displacement of cold water.
Why are metals good conductors
Because they have many free electrons which can move about inside of the metal. The free elections collide with the other atoms in the metal resulting in a faster transfer of energy.
How does an immersion heater work
Heat is transferred to the water through conduction. Then the colder water is displaced to the bottom of heater due to it being more dense and is then warmed by the heater rising above the previously warmer water.
What happens to the density of water and Gas when heated.
The both decrease in density due to the increased energy, which weakens the inter molecular bonds
State 3 ways in which heat energy can be transferred
Heat energy can be transferred in 3 ways. In conduction, convection and radiation
