Chapter 15~stationery Waves Flashcards
Definitions, key ideas 💡 and formulae
Definition of a stationary wave 🌊 :
A wave pattern produced when 2 progressive waves of the same frequency travelling in opposite directions combine. It is characterised by nodes and antinodes. Also known as a standing wave 🌊.
Definition of a node
A point on a stationary wave with zero amplitude.
Definition of an antinode:
A point on a stationary wave 🌊 with maximum amplitude.
What is a progressive wave 🌊?
A wave that transfers energy from one place to another
The difference in the property of energy in a stationary wave 🖍️ and a progressive wave⏩ :
🖍️Stationary wave :
No net energy transfer from one point to another (energy is stored within the wave)
⏩Progressive wave :
There is a net transfer of energy ⛮
Difference of the property amplitude for stationary and progressive waves
🖍️ Stationary :
amplitude varies from zero at nodes to a maximum at antinodes.
⏩Progressive :
Amplitude is the same for all particles within a wave.
The difference between the property of frequency between a stationary 🖍️and progressive ⏩ wave
🖍️Stationary wave :
All the particles oscillate at the same frequency except those at nodes.
⏩Progressive wave :
All the particles oscillate at the same frequency.
The difference in the property of wavelength for a stationary 🖍️ wave and a progressive ⏩wave
🖍️Stationary wave :
The wavelength is equal to twice the distance between adjacent nodes
⏩Progressive wave :
The wavelength is equal to the distance between particles at the same phase
The difference between the property of phase difference between 2 particles of stationary 🖍️and progressive ⏩ waves
🖍️Stationary wave :
Between nodes all particles are at the same phase. Between adjacent loops particles are in antiphase.
⏩Progressive wave :
Any two particles have phase difference equal to [2×pi×d]÷♈, where “d” is the distance between two particles
What are the 5 properties that show the differences in progressive ⏩ and stationary 🖍️ waves?
- Energy ⛮
- Amplitude
- Frequency
- Wavelength ♈
- Phase difference between 2 particles
What caused the formation of a stationary 🖍️ wave?
They are formed when two progressive waves travelling in opposite directions ( towards one another) with the same frequency and speed, superpose.
Define internodal :
It is the distance between any two successive nodes
2 adjacent nodes (or antinodes) have a distance of?
1/2 ♈
Understanding experiments on pg 213 onwards are NB!
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