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AQA - A Level Physics - Waves #1

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Quiz by Nighthawk
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Last updated: July 8, 2020
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First submittedJuly 8, 2020
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Answer
Define amplitude
Maximum displacement of the medium from equilibrium
Define frequency
The number of wave cycles per second OR the number of waves passing a point per second
Define time period
Time for one complete wave cycle
What is the relationship between frequency and time period?
f = 1/T or inverse proportionality
Describe a transverse wave
Displacement/oscillation of medium/particles is perpendicular to the direction of wave propagation
What is meant by coherent sources of waves
Same frequency and constant phase difference.
Describe the principle of superposition
When two or more waves meet the total displacement is the (vector) sum of the displacements of the individual waves.
Give an example of longitudinal waves
Sound, primary seismic waves
Give an example of transverse waves
Waves on a plucked string, secondary seismic waves, electromagnetic radiation
Describe plane polarised light
Electromagnetic waves with oscillations in a single direction perpendicular to wave propagation
Describe unpolarised waves
Waves with oscillations in many directions perpendicular to wave propagation.
Which waves can't be polarised?
Longitudinal waves
 
Answer
What is the phase difference between points quarter a wavelength apart?
Pi/2 radians OR 90'
What is the phase difference between waves in antiphase
Pi radians OR 180'
Describe the effect of a polarising filter
Only transmits the component of the wave oscillating parallel to the polarising filter
Describe the effect of two polarising filters perpendicular to each other
No light is transmitted
Give a use of polarising filters
Reducing glare in sunglasses and camera, 3D TV, LCD screens,
Light reflected from a shiny surface is
partially polarised
Light scattered is
polarised
Define oscillation
A displacement one way and then the other about an equilibrium position.
Define displacement (waves)
Measures how far a particle is from its equilibrium position.
Define propagation
Describes the motion of a wave through a medium/space
Define a mechanical wave
Requires a medium to travel in
What is µ in f = (1/2L)×√(T/µ)
Mass per unit length of the string kgm⁻¹
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