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LC Physics
LC Physics
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From looking at the past papers about 90% of the marks for Biology can be gained from knowledge of all the definitions and theory. Most questions are not direct definitions but theory questions like "describe the..." and "draw the...". Direct definitions are about 20% of the paper. As the paper is mostly theory based, calculations are quite rare unlike chemistry and physics.

For chemistry on the other hand the marks are more mixed up. I would say about 55 - 60% can be gained from definitions and theory while the rest come from calculations. The first few lab experiment and... (More)

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LC Physics

Force, Mass and Momentum – Definitions

Force is anything that causes the velocity of an object to change.

  • Force has direction in which it acts – it is a vector quantity.
  • The symbol for force is F.
  • The unit of force is the newton (N).
  • Acceleration of a body is directly proportional to the force causing it, i.e. for a given body:

Mass

The mass (m) of a body is a measure of how difficult it is to accelerate that body.

  • The unit of mass is the kilogram (kg).
  • Acceleration of a body is
  • i.e for a given... (More)
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LC Physics

Semiconductors

Semiconductors (n-type and p-type)

N-type semiconductor 

  • Silicon doped with phosphorus
  • majority charge carriers are negatively charged electrons
  • holes in this material are the minority charge carriers

P-type semiconductor 

  • Silicon doped with boron
  • majority charge carrier is the positively charged holes
  • minority charge carriers are the negatively charged electrons

 

 

 

Capacitance Sample Answer 2018 Q12c