Download - Bibin powerpoint presentataion
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Waves
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What are waves? A wave is a phenomenon in which
energy is transferred through vibration.
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Types of Waves Transverse Waves
Longitudinal Waves
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Transverse Waves are waves which travel in a direction
perpendicular to the direction of vibrations.
Direction of vibrations
Direction of wave
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Generating Transverse Waves
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Transverse Wavesexamples include
water wavesrope waveslight waveelectromagnetic waves
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Longitudinal Waves are waves which travel in a direction parallel to
the direction of vibrations.
Direction of vibration
Direction of wave
examples includesound wavessound waves
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Generating of Longitudinal Waves [slinky spring]
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Characteristics of A Wave Crests and Troughs Amplitude Wavelength Frequency Period Speed
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Crests and Trough Crests are high point of a wave Troughs are low point of a wave
displacement
distance
crest crest
troughtrough
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Amplitude (A) is the height of a crest or depth of a
trough measured from the normal undisturbed positions.
displacement
distance
crest crest
trough
Amplitude
Amplitude
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SI Unit For Amplitude is measured in metres (m)
displacement
distance
crestcrest crestcrest
trough
Amplitude
Amplitude
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Wavelength () is the distance between two
successive crests or troughsdisplacement
distance
Amplitude
AmplitudeAmplitude
crestcrest crest
trough trough
Wavelength
Wavelength
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SI Unit For Wavelength is measured in metres (m)
displacement
distance
Amplitude
Amplitude
crestt crest
trough trough
Wavelength
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Frequency (f) is the number of vibrations in one
second.
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SI Unit For Frequency is the Hertz (Hz)
1 Hz is 1 vibration in 1 second.
50 Hz is 50 vibrations in 1 second.
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Test Yourselves Explain the meaning of
28 Hz, 100 Hz , 135 Hz, 1570 Hz.
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Period (T) is the time taken for one complete
vibration. (or oscillation or cycle)
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SI Unit For Period is measured in second (s)
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Relationship between Period (T) and Frequency (f)
f = 100 Hz T = 1/100 s f = 40 Hz T = 1/40 s f = 23 Hz T = 1/23 s f = 8 Hz T = 1/8 s f = f Hz T = 1/f s
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Relationship Between f and T
f1T
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Speed Of a Wave is the distance moved in one second.
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SI Unit For Speed is measured in metre per second (ms-1or m/s)
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Wave Equation Speed of a wave
= wavelength period= wavelength x frequency
where v = speed, f = frequency and = wavelength V = f
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Describing WavesDisplacement-Time Graph
for one particle on the wave
timetime
displacementdisplacement