Y7 Sound and Light Waves Flashcards
Longitudinal waves
Sound waves are longitudinal waves that vibrate in the same direction as the direction of travel.
Transverse waves
Light waves are transverse waves which travel in right angles and are picked up by our eyes so we can see
Amplitude
It is the distance from the middle of the wave to top or bottom. This determines the loudness of the of the wave.
Peak/Crest
The top of the wave.
Trough
The bottom of a wave.
Frequency
It is the amount of waves passing in a second. The more waves that passes in a second ,the more hight the pitch.
How is sound produced.
It needs a medium to be able to vibrate ,then it vibrates the air particles and gets picked up by our ears.
When does light refract?
It refracts when the light passes through a different medium and gets slowed down and changes direction.
What happens when light enters a glass prism?
Dispersion happens but it still refracts and slows down but it shows the 7 colours that make up light.
Red Orange Yellow Green Blue Indigo Violet
How is high sound produced?
More vibration makes a higher pitched sound so the particles would be joined up together and have less kinetic energy.
How is low sound produced?
Low notes are produced by particles that have more kinetic energy so they could be stretched maybe.
How can we record the waves of light and sound?
By drawing a graph
A light source is…
What creates light.
For eg.
Lamps and Fire
How is light useful?
It helps us see
What is the speed of light?
300M meters a second!
