which direction does energy (in the form of heat) flow?
from a hot body to a cold body making the temperature decrease
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how do you measure temperature?
using a thermogram
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what colours in the thermogram show what?
yellow- hot blue- cold
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what is the difference between heat and temperature?
heat=measurement of internal energy on an absolute scale temperature= measurement of hotness on an arbitrary scale
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what is specific heat capacity?
the energy needed temperature of 1kg by 1oC
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What happens when a object is heated? (shc)
its temperate rises and energy is transferred
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what is specific latent heat?
the energy needed to melt or boil 1kg of the material
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what happens when an object is heated (slh)
energy is transferred but the temperature remains constant
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what does the energy have to do when a substance changes state
break the bonds that hold the molecules together
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how does Double glazing keep the house warm?
reduces energy lost by conduction as the gap between the two pieces of glass is filled with a gas or contains a vacuum
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how does loft insulation keep the house warm?
reduces loss by conduction and convection
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how does cavity wall keep the house warm?
reduces heat by conduction and convection
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how does insulation blocks keep the house warm?
reduces energy transferred by radiation
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how can energy be transferred by CONDUCTION
due to the transfer of kinetic energy between particles
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how can energy be transferred by CONVECTION
a gas expands when its heated. This makes it less dense so it rises
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why does radiation not need a material to transfer energy?
because it can be transferred through a vacuum e.g. space
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crest of a wave is
the highest point on a wave
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the trough is
the lowest point on a wave
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the wave length is
one trough to another trough
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refraction occurs because
the speed of the waves decrease as the wave enters a more dense medium and increases as the wave enters a less dense medium.
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diffraction is
the spreading out of waves as it passes through a gap- the smaller the gap the more diffraction happens
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morse code is
a series of dots and dashes to represent the alphabet
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what is morse code an example of
digital signal
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what ways can a signal be sent instantaneously?
when its sent by light, electricity,microwaves or radio
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what normally happens when white light travels from one material to another?
it is refracted
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what happens if the angle of incidence is bigger than the critical angle
the light is reflected
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what is an endoscopy?
it allows doctors to see inside the body without the need for surgery
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how does endoscopy work?
1) light passes along one set of optical fibres to illuminate the inside of the body 2) the light is reflected 3) the reflected light passes up another set of fibres to an eyepiece or camera
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Other cards in this set
Card 2
Front
how do you measure temperature?
Back
using a thermogram
Card 3
Front
what colours in the thermogram show what?
Back
Card 4
Front
what is the difference between heat and temperature?
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