P1: Energy for the home

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  • Created by: Theex
  • Created on: 28-04-14 15:40
Complete the statement: Heat energy always flows...
... from a high temperature to a low temperature
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Define: Specific heat capacity
How much energy is require to increase the temperature of 1kg of a substance by 1 degree celcius
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What is the equation concerning SHC?
Energy transferred = mass * SHC * temperature change
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Why do heat graphs have parts which are flat?
Because the substance is changing state so the energy is being used elsewhere
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Define: Specific latent heat
The amount of energy required to change the state of 1kg of a substance
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What is the equation concerning SLH?
E = m * SLH
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Briefly explain conduction in terms of particles
When particles gain heat energy they vibrate and collide with neighbouring particles transferring some energy to them.
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Why are metals very good conducters?
Delocalised electrons are free to move through solid transferring E to different areas more rapidly
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Briefly explain convection in terms of particles
When particles, in a gas or liquid, gain energy gain energy they become less dense and particles with less energy are denser so they fall, when particles rise and enter a cool area they lose energy and fall creating a convection current
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Which spectrum of electromagnetic wave is used to transfer heat energy by radiation?
Infrared waves
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Are objects that are black good or bad emitters/absorbers of heat radiation?
Good
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Are objects that are white good or bad emitters/absorbers of heat radiation?
Bad
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How does food get cooked in a microwave?
Microwaves penetrate roughly 1cm into the food and transfer energy to the fat and molecules which then cook the food via convection currents
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How does food get cooked in a conventional oven?
Infrared waves transfer energy to surface molecules which then transfer heat via conduction to the rest of the food
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Name 6 types of home insulation
Draught proofing, double glazing, hot water tank jackets, cavity wall insulation, thick curtains and loft insulation
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What is the equation to calculate payback time?
payback time = initial cost / annual saving
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What machine displays amount of heat based on colour?
Thermogram
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What is the equation for calculating efficiency?
Eff = (E Out / E In) * 100
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What is the equation for wave speed?
v = f * λ
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Define: frequency
The number of oscillations passing a certain point per second, measured in Hz
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The distance from crest to equilibrium on a wave is called?
The amplitude
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What is wavelength?
The distance from the peak of one wave to another
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What is the relationship between angle of incidence and angle of reflection?
Angle of I = Angle of R
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Total internal reflection occurs when?
The angle of I is created than the critical ange of that substances
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When does maximum diffraction occur?
When the gap is the same size as the wavelength
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Why does a wave change direction when it passes into a new medium at an ange?
Part of the wave slows while another part moves faster causing a slight bend and thus a change in direction
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What happens when EM radiation of a high enough frequency is absorbed?
Ionisation
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Name two wave types and their uses in communication
Microwaves - mobile phones, radiowaves - radios
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What is the main advantage of communication via light?
Really fast
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Describe a laser light?
All waves have the same length and frequency making the monochromatic and waves are also in phase making them coherant, Finally laser light has low divergence
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Is a pit when there is thinner part of the CD or thicker bit?
Thicker bit
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Is a land when there is thinner part of the CD or thicker bit?
thinner
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What actually represents the on's of the off's in CDs?
The difference in time it takes the laser to return
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Name 5 uses of infrared waves?
Cooking - grills/toasters, remote controls, transmit information over short range, temperature monitoring and optical fibres
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Why can long wavelength radio waves transmit long distance and without line of sight?
Because of their large wavelength they undergo high amount of diffraction when they enter the ionsphere and bend a round the surface of the Earth
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What is necessary for short wavelength communication?
Line of sight between transmitter and reciever
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What happens to medium wavelength waves when they enter the ionosphere and how does this help to transmit them further?
They undergo diffraction at a very tight angle so they then 'bounce' back to Earth and so on
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Name two advantages of digital communication and a disadvantage
Less interference and it allows multiplexing but compression can reduce sound quality
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What is the concern over the use of mobile phones?
The microwaves used to transmit radiaition may ionoise cells when absorbed however there is a lacking in conclusive proof
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What is the size of an EM reciever dependant upon?
The size of the wave it is recieing as less diffraction means clearer signal
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What is the name given to small telescopes to describe their limitations?
They're said to be diffraction limited
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Why are analogue signals more prone to interference compared to digital signals?
Because they can take a range of values so it is difficult to seperate to overlapping signals whereas digital only has two possible values so is easily seperated
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What chemical group damages the ozone layer?
CFCs
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What type of wave are S - waves and what medium(s) can they travel through?
They transvere - oscilate at right angles to direction of movement, and they can only travel through solids
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What type of wave are P - waves and what medium(s) can they travel through?
They longitudinal - oscilate is the same plane as the direction of movement, they can travel through liquids and solids
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Other cards in this set

Card 2

Front

Define: Specific heat capacity

Back

How much energy is require to increase the temperature of 1kg of a substance by 1 degree celcius

Card 3

Front

What is the equation concerning SHC?

Back

Preview of the front of card 3

Card 4

Front

Why do heat graphs have parts which are flat?

Back

Preview of the front of card 4

Card 5

Front

Define: Specific latent heat

Back

Preview of the front of card 5
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