The sound of music Edexcel Physics

Sound of music

AS edexcel Physics

TO will need to add picturs such as reflection

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  • Created on: 09-01-13 11:17
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The sound of music ­revision
Sound waves are generated by vibrations (oscillations)
-One complete oscillation is called a cycle
-The time taken for one oscillation is the period (T) measured in seconds
- the number of oscillations in one second is frequency (F) measure in hertz(HZ)
Sounds waves are represented
Phase
Phase describes a stag or point in an oscillation . Wecan use this idea to compare two oscillations by
looking at the phase difference between them.
Phases can be measured in three ways
1. A complete cycle can be represented as 360o
So half a cycle is 180o
So quarter cycle is 90o
2. A complete cycle can be represented as 2 radians
Half a cycle is 1 rad
Quarter cycle is
3. A complete cycle can be represented as Ts (1 period)
complete cycle is Ts
half a cycle is T
2
quarter cycle is T
4

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Oscillations in phase are in time with each other and have zero phase difference
Oscillations in anti-phase are exactly opposite to each other and have a phase difference of
180 or rad
Any other difference of phase is called out of phase
Types of waves
Transverse ­ the particle disturbance is at right angles to the direction of travel.…read more

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Superposition
This is what happens when two waves meet or overlap. At this point, the combined
displacement is the sum of the individual displacement.
1. Peak meets peak
2. Trough meets trough
3.…read more

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Node to node is half a wavelength
You can only get s standing wave form when a whole number of " half wavelengths" fit into
to the total length available
E.g.…read more

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The series of standing waves that can be set up on a given length are known as harmonies or
overtones
All of these harmonics play simultaneously on different stringed instrument
The frequencies of these harmonies are all multiples of the fundamental
e.g.…read more

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Speed of waves in strings and air columns
Compact discs
CDs are read by reflections of laser light from a series of dips and bumps, which
spiral around the disk
Laser light is coherent- there is a constant phase difference, which means frequency
and amplitude are always the same.…read more

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vishal nankani

i love you 

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