Year 9 Physics of Sound

1. What is sound?

• energy
• matter
• light
• radio waves

2. How is sound created?

• by vibrations
• by heat
• by electricity
• by chemicals

3. What is a sound wave?

• movement of air particles
• visible light
• water flow
• heat transfer

4. How do we hear sound?

• when our ear is within range of the vibrations
• when we touch an object
• when we see an object
• when we taste an object

5. What is the difference between noise and musical notes?

• irregular repeating waves produce noise while regular repeating waves produce musical notes
• regular repeating waves produce noise while irregular repeating waves produce musical notes
• both produce the same sound
• none of the above

6. How can sound be displayed?

• as a two dimensional waveform
• in a three dimensional graph
• in a pie chart
• in a bar chart

7. What does the X-axis of a waveform represent?

• time
• volume
• pitch
• amplitude

8. What does the Y-axis of a waveform represent?

• volume
• amplitude
• time
• pitch

9. What is wavelength?

• the distance from one point to the same point in the same direction
• the distance from one point to a different point in a different direction
• the distance from one point to a different point in the same direction
• the distance from one point to a different point in the opposite direction

10. What is frequency?

• the rate at which a waveform repeats
• measured in Hz
• measured in kHz
• all of the above