P3 - Unit 3

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What are x-rays used for?
CT scans and destroy tumors.
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What are ultrasounds used for?
Diagnosis, e.g. baby scans and treatment, e.g. shatter kidney stones.
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What is refractive index?
A measure of how much a substance can refract a light.
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What does a converging lens do?
Focuses parallel rays to a point called the principle focus.
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What does a diverging lens do?
Makes parallel rays spread out as if they came from a principal focus point.
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How is a real image formed?
By a converging lens if the object is further away than the principle focus point.
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How is a virtual image formed?
By a diverging and converging lens if the object is nearer the lens than the principle focus point.
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Where is light focused?
Onto the retina by the cornea and eye lens.
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What is a moment?
A measure of the turning effect of the force on an object.
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What is the centre of mass?
The point where it's mass can be thought to be concentrated.
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What is equilibrium?
When the centre of mass is directly beneath the point of suspension.
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How can the stability of an object be increased?
By making the base as wide as possible and centre of mass as low as possible.
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Why will an object topple over?
If the line of action of it's weight is outside it's base.
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What is an electromagnet?
A coil of insulated wire wrapped around an iron core.
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What are electromagnets used in?
Scrapyard cranes, circuit breakers, electric bells and relays.
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What is a transformer?
Two coils of insulated wire, wound around the same iron core.
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What are transformers used in?
The National Grid.
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What is an ECG used for?
To measure potential differences generated by the heart.
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What is an endoscope used for?
To look inside the body without making large incisions.
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Other cards in this set

Card 2

Front

What are ultrasounds used for?

Back

Diagnosis, e.g. baby scans and treatment, e.g. shatter kidney stones.

Card 3

Front

What is refractive index?

Back

Preview of the front of card 3

Card 4

Front

What does a converging lens do?

Back

Preview of the front of card 4

Card 5

Front

What does a diverging lens do?

Back

Preview of the front of card 5
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