Music to your Ears How do astronauts communicate

Music to your Ears How do astronauts communicate with each other? Starter: ‘’In Space, no-one can hear you scream’’ Is this true? Explain your answer

Music to your Ears Objectives: • Understand how sound can be detected (L 4) • Describe how sound waves can be displayed using an oscilloscope (L 5) • Explain the some relationships shown in a sound wave (L 6)

Loudspeakers convert the signal from the signal generator into sound waves. Signal generators can produce signals over a range of frequencies and of varying amplitudes. Oscilloscopes allow us to study frequency and loudness of a sound

Pitch (or frequency) A high pitch sound A low pitch sound The shorter/longer the wavelength of the wave on the trace; the lower/higher the frequency of the sound The more waves you see, the higher the pitch/frequency

Oscilloscope Traces Which trace represents the highest pitched sound? A B ‘A’ is the highest pitched sound because it has the shortest wavelength/most number of waves visible.

Loudness A quiet sound A louder sound The larger/smaller the amplitude of the wave on the trace, the louder/quieter the sound. The bigger the wave you can see, the louder the sound

Oscilloscope Traces Which trace represents the loudest sound? A B ‘B’ Is the loudest sound because it has the largest amplitude • The larger the amplitude the more energy a wave has • The more energy it has, the louder the sound

What can I hear? http: //www. youtube. com/watch? v=RC 8 SV 3 L 3 bo 0 Increase frequency of signal on the generator whilst keeping the volume the same. 20 The lowest frequency I can hear is ____ Hz 000 Hz The highest frequency I can hear is 20 ____

Animal Hearing Ranges Which animal can hear the lowest highest frequency? moths pigeons

What does the sound look like? Draw a high pitch sound Draw a low pitch sound Draw a high pitch and loud sound Draw a quiet sound

Sound Dominoes Who will lose their cards first?

Music to your Ears Objectives: • Understand how sound can be detected (L 4) • Describe how sound waves can be displayed using an oscilloscope (L 5) • Explain the some relationships shown in a sound wave (L 6)

Plenary: 1) Explain to your partner the words below 2) Write a sentence about each word Vibration Pitch Loud Quiet Hertz