Flashcards
P1 key points
Flashcards do conjunto (20)
- 1What is specific heat capacity?The energy needed to raise the temperature of 1kg of the material by 1°c - (J/Kg°c)
- 2What is specific latent heat?The energy needed to melt or boil 1kg of the material - (J/Kg)
- 3When a substance changes state why is there no temperature change?Because the energy is needed to break the bonds that hold the molecules together.
- 4What is double glazing and what does it do?To pieces of glass with a gap between that is filled with gas or contains a vacuum. Reduces energy loss by conduction. Particles in a gas are far apart, it is very difficult for energy to transfer. There are no particles in a vacuum so it is impossible to transfer energy by conduction.
- 5What does loft insulation do?Reduces energy loss by conduction and convection. Warm air in the home rises, energy is transferred through the ceiling by conduction, air in the loft is warmed by the top of the ceiling and is trapped by the oft insulation, both sides of the ceiling are at the same temperature so no energy is transferred. Without loft insulation, the warm air in the loft can move by convection and heat the roof tiles, energy is transferred to the outside by conduction.
- 6What does cavity wall insulation do?Reduces energy loss by conduction and convection. The air in the foam is a good insulator, the air cannot move by convection because it is trapped in the foam.
- 7What are insulation blocks and what do the do?Used to build new homes, have shiny foil on both sides to reduce energy transfer by radiation. Energy from the sun is reflected back to keep the homes cool in summer. Energy from the home is reflected back to keep the home warm in winter.
- 8What is conduction?Energy transferred due to the transfer of kinetic energy between particles.
- 9What is convection?Energy transfer by a gas. A gas expands when it is heated. This makes it less dense so it rises.
- 10What is radiation?Energy transfer that does no need a material to transfer energy. Energy can be transferred through a vacuum.
- 11What is the amplitude of a wave?The maximum displacement of a particle from its rest position.
- 12What is the electromagnetic spectrum?Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma ray
- 13Why does refraction occur?Because the speed of the waves decreases as the wave enters a more dense medium and increases as the wave enters a less dense medium. The frequency stays the same but the wavelength decreases.
- 14What is diffraction?The spreading out of a wave as it passes through a gap.
- 15What does the amount of diffraction depend on and when does it occur most?It depends on the size of the gap. It occurs most when the gap is the same size as the wavelength. Larger gaps show less diffraction.
- 16What is morse code?A series of dots and dashes to represent letter of the alphabet.
- 17What is white light made up of?Different colours of different frequencies out of phase.
- 18What is laser light made up of?It only has a single frequency, is in phase and shows low diverge.
- 19Whats an endoscopy?- Light passes along one set of optical fibres to illuminate the inside of the body
- The light is reflected
- The reflected light passes up another set of fibres to an eyepiece or camera - 20—
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- GCSE Physics FlashCards sobre P1 key points, criado por Georgia Chrysandreas em 10-06-2017.
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- Georgia Chrysandreas
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