P3 flash cards

What happens when light rays travel from a more dense medium to a less dense medium?
They refract away from the normal.
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What is the difference between a converging lens and a diverging lens?
A converging lens refracts light to give a real image. A diverging lens spreads out light to give a virtual image.
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What is "short sight" and how can it be corrected?
Shortsight is where the cornea is too thick and so light from distant objects is not focussed on the retina; distant objects therefore look blurry. The person could wear glasses or contact lenses using a diverging lens to overcome this problem.
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What two procedures are X-ray machines used for in hospitals?
Imaging bones and treating cancer cells.
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What is meant by the letters ECG and what heart disorders can it diagnose?
ECG=Electrocardiogram. This can diagnose a damaged heart muscle or blockage.
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What are the five types of radioactive radiation?
Alpha, Beta-, Gamma, Positron, Neutron.
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What happens during β- decay?
A neutron changes to a proton; a neutron is emitted to balance the charge.
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How are Radioisotopes used to trace the flow of blood through an organ?
The isotope is injected into the blood and recorded by a Gamma camera,
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What is the name of the force that acts on an object to keep it moving in a circle?
Centripetal force
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What direction does centripetal force act in?
Cebtripetal force acts towards the centre of the circle of the travelling object.
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What provides the force that makes particles move in a circle in a cyclotron?
Magnetic field
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What type of radiation is detected during PET scanning and how is it produced?
Gamma is detected. It is produced as a positron interacts with an electron in a process called annihilation.
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A light ray travels from crown glass into perspex so that the refracted ray passes along the boundary between the two materials. What does the value of the critical angle depend on?
The critical angle depends on 'the refractive index'.
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Where on an N-Z graph would you find a radioisotope that undergoes β+ emission?
A radioisotope that undergoes β+ emission would be found below the curve.
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Other cards in this set

Card 2

Front

What is the difference between a converging lens and a diverging lens?

Back

A converging lens refracts light to give a real image. A diverging lens spreads out light to give a virtual image.

Card 3

Front

What is "short sight" and how can it be corrected?

Back

Preview of the front of card 3

Card 4

Front

What two procedures are X-ray machines used for in hospitals?

Back

Preview of the front of card 4

Card 5

Front

What is meant by the letters ECG and what heart disorders can it diagnose?

Back

Preview of the front of card 5
View more cards

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