8LB: Music to your ears

Learning Objectives:1.Identify the different parts of a sound wave2.Describe the relationship between wave amplitude and intensity + wave frequency and pitch

A sound can be…

Write down words that describe sounds?

Scientist use microphones to detect sounds.

If a microphone is attached to a oscilloscope, you can see a representation of the sound wave.

By looking at the wave (trace) on the oscilloscope screen, we can describe what the sound is like.

What are sound waves

The height of a wave is called its amplitude. (a high amplitude is a loud noise)

The number of complete waves (cycles) is called frequency

(measured in hertz or Hz)

The distance between the same point on 2 cycles is called a wavelength.

(waves with higher frequencies have shorter wavelengths)

(L.O:1)

Draw a wave with a high frequency and short wavelength + label

Draw a wave with a low frequency and low wave length + label

Draw a wave with a high amplitude, high frequency and short wavelength

Questions

If the wave has a high amplitude it is going to be loud

If the wave has a high frequency it is going to be high pitch

(L.O:2)

Video

Sound= Vibrations

Read pages 164- 165 in the book and then answer questions 1-7

Once you have finished this I will project an extension on the board.

Questions

Label the sound wave

If a wave is loud it must have a high …..

A high pitch sound will have a high ….

Plenary