## Wednesday, October 21, 2009

### [Physics SPM] Exam Pointers II

Source: Maths & Science Guide

Revision

1. What are waves?

2. What is meant by "speed"?

Frequent Mistakes

• Waves are energy produced by oscillations that is able to transfer through medium and travel through vacuum.

1. Waves are the propagation of energy through the oscillation of particles of a medium.

2. It is the rate of change of distance. It is = (distance/time). When an object travels a distance of 20m in 10s, its speed is (20/10) = 2m/s. It is scalar quantity.

• The command phrase is "What is meant". Thus, you can choose to give the definition of speed, OR examples that provide the meaning of speed.

#### 1 comment:

1. What is the propagation actually? I cant imagine the sentence if I dont know its meaning...

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