6.1 waves 2
TRANSCRIPT
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6.1WAVES
DESCRIBINGWAVES
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LEARNING OUTCOMES State what is meant by a wavefront
State the direction of propagation of
waves in relation to wavefronts
Define period
Define frequency
Define wavelength
Define wave speed
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Ripple Tank The phenomenon ofwater waves can be
investigated using aripple tank.
The water waves are
produced by a
__________ bar on the
water surface.
vibrator
The tank is leveled so
that the ________ of
water in the tank is
uniform to ensure waterwaves propagate with
___________ speed.
depth
constant
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Ripple tank
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When the motor
is switched on,plane waves areproduced.
A round dipper
fixed to the barwill producedcircular waves.
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How the dark and bright bands areformed on the screen?
The water acts as a_______ toproduce a patternof ________ and
lens
bright
_________on a piece of whitepaper placedunder the tank
when light passesthrough it.
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Water waves have crests and
troughs.
A crest is the highestposition of the wave acts as a
________ lens and will focus
the light rays. So _______
re ion will roduced.
convex
bright
A trough is the lowest
position acts as a __________
lens and will diverge the
light rays. So _________region will be produced.
concave
dark
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Wavefronts
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What is meant by a wavefront? Lines joining all the points of the ______
phase are called wavefront.
same
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2 Types of wavefrontPlane waves Circular Waves
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The direction of propagation of wavesin relation to wavefronts The wavefronts of a transverse wave
and longitudinal wave are_____________to the direction ofperpendicular
propagation of the waves.
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Describing Wavesmp u e
Period
Frequency
WavelengthWave speed
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Amplitude The maximum displacement from its
equilibrium position.
SI unit: meter, m
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Amplitude A mass, m, is hung to a spring. The
spring is at rest or in the equilibriumposition at O
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The amplitude, a, is the distance fromthe equilibrium position, O to themaximum displacement X or Y
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The amplitude, a, is the distance fromthe equilibrium position, O to themaximum displacement X or Y.
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Period, T When the
pendulumswings from A to
B and back to A,the pendulum issaid to havedone one
completeoscillation
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Period, T The time taken
for an oscillationto complete one
The number ofwaves producedin one second.
Frequency, f
cycle.
SI unit is second(s)
SI unit is Hertz(Hz)
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Frequency & period
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Frequency & period
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What is the frequency of the swinging
plasticine ball?
Period is the time required to complete
one oscillation
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Wavelength,
Wavelength, , is the distance between twoconsecutive points which are in phaseSI unit: meter, m
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Wavelength,
For a transverse wave,Wavelength, , is the distance between twosuccessive crest or trough.
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Wavelength,
For a longitudinal wave, the wavelength, , isthe distance between two successivecompressions or rarefractions.
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Speed, v The measurement of how fast a crest ismoving from a fixed point.SI unit is ms-1.
Wave Speed, v
SI unit is ms-1.
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QUESTION 2
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QUESTION 3
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QUESTION 4