Physics

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  • Created by: RP
  • Created on: 21-05-14 19:25
What is the difference between temperature and heat?
Temperature is a measure of how hot or cold something is. It is measured using a thermometer in °C. Heat is the amount of thermal energy an object contains.
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Where are bimetallic strips used?
Fre alarms,***** gets hot because of fire, it expands and bends causing the alarm to ring. Thermometers, as one metal expands one contracts so the hot ***** bends to the hot side. Thermostats, bend the bimetallic ***** turning the heater on or off.
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How does expansion happen in a solid?
Particles in a solid called atoms vibrate and when heated vibrate even more pushing each other further and further apart. THE ATOM STAYS THE SAME SIZE
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what rarefaction and compression
rarefation - when particles are spread out. Compression when particles are close together
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Explain conduction
Heat energy travels from left to right. Atoms at the hot end vibrate more and more causing their neighburs to vibrate.
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Explain convection in water
Water is heated, it expands, becomes less dense, rises, cooler water takes its place and that is a convection current
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What correcting lens is needed for short sight? What correcting lens is need for long sight?
Short sight - concave or diverging lens. Long sight - convex of converging lens.
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Explain radiation
Heat radiation travels as a wave and does not need particles.
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Give 7 ways to prevent heat loss in your house
curtains, loft insulation, double glazing, curtains, cavity wall insulation draught excluders, white paint
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Which would absorb more heat and which would emit more heat? A black car or silver foil
Black car would absorb heat. Silver foil will emit heat.
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Give me four reasons how vacuum flasks prevent heat from escaping.
Sivered surfaces to reflect radiation, Stopper made from cork or plastic (insulators), Glass wall to stop heat transfer, vacuum to stop convection and conduction
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properties of light - 3 of them
LLight is invisible unless reflected by dust, chalk, water of a non-luminous object, Travels in straight lines called rays which when gathered togeth is called a beam of light, travels at 300,000,000 metres per second.
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what does the image created by a pinhole camera look like?
Image is upside down, wrong way round, dull and smaller than the original object.
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what is the purpose of the light proof box and the eye ball?
allows light to enter only though the lens
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what is the purpose of the lens both camera and eye? and what is the purpose of the shutter and eyelid?
the lens focuses the light to give a clear image. Both the shutter and eyelid control when the light enters
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Q1. what is the purpose of the film/sensor and the retina. Q2. what is the purpose of the aperture(diaphragm) and pupil(iris)?
The film/sensor and retina records the image. The aperture and pupil controls how much light enters
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What can't someone with short sight do? What can't someone with long sight do?
Someone with short sight cannot see distant object clearly. Someone with long sight cannot see close objects clearly.
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explain how we hear sound.
sound waves travel down our ear canal and vibrate our ear drum. the tiny vibrations are magnified by the three bones. these vibrations pass through a liquid in the cochlea. the vibrations stimulate nerve endins that transmit electrical signals to the
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Amplitude? Frequency? Hertz? Wavelength?
1.The amplitude of a wave is its maximum disturbance from its undisturbed position.2. number of complete waves per second. 3. standard unit of measuring frequency. 4. The distance between two crests.
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what is a transverse wave and a longitudinal wave?
a transverse wave is a wave that has vibrations at a right angle to the way the wave moves. A longitudinal wave's vibrations go in the same direction as the wave moves.
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Other cards in this set

Card 2

Front

Where are bimetallic strips used?

Back

Fre alarms,***** gets hot because of fire, it expands and bends causing the alarm to ring. Thermometers, as one metal expands one contracts so the hot ***** bends to the hot side. Thermostats, bend the bimetallic ***** turning the heater on or off.

Card 3

Front

How does expansion happen in a solid?

Back

Preview of the front of card 3

Card 4

Front

what rarefaction and compression

Back

Preview of the front of card 4

Card 5

Front

Explain conduction

Back

Preview of the front of card 5
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