Section 3: Waves & Sound

Topics that will be covered are as follows

a) Units & Definitions
b) Properties of waves
c) The electromagnetic spectrum
d) Light and sound

 

a) Units

 

Examiner's Expectation: 3.1 Students will be assessed on their ability to use the following units: degree (o), herts (Hz), meter (m), meter/second (m/s), second (s).

 

S.NoQuantityunitSymbol
1

Frequency

Definition:

Number of vibrations in a second.

OR

number of cycles in a  second

OR

In case of waves:

Total number of waves passing through a single point/mark in a second.

Hertz

or

Cycles/second

Hz
2

Wavelength


Definition: distance between two consecutive crest or trough.

wavelength

Meter

m

3

Speed of waves is related with the frequency and the wavelegth as 

speed of wave = frequency x wavelength

Meter/second m/s

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