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Wave Equation

          
The velocity of a wave can be found from
   
v = λf
   
where
v = velocity of the wave (unit: m/s)
λ = wavelength (unit: m)
f = frequency (unit: hertz)
   
From the following graphs, the frequency and velocity of the wave can be determined.
     
Displacement against Distance Graph
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λ = wavelength = 2 cm,
a = amplitude = 5 cm
     
Displacement against Time Graph
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T = period = 2 s
a = amplitude = 5 cm
     
frequency, f = T-1 = 2-1 = 0.5 Hz
 
velocity, v = wavelength, λ   X   frequency, f
v = λf
v = 2 cm X 0.5 Hz
= 2 X 10-2 m X 0.5 s-1
= 1.0 X 10-2 ms-1
See also
o  waves
o  transverse waves
o  longitudinal waves

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Persamaan Gelombang
         
Halaju gelombang boleh ditentukan daripada persamaan berikut
   
v = λf
   
di mana
v = halaju gelombang (unit: m/s)
λ = panjang gelombang (unit: m)
f = frekuensi (unit: hertz)
   
Daripada maklumat graf berikut, halaju gelombang dapat dikirakan seperti berikut
 
Graf Sesaran melawan Jarak
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λ = panjang gelombang = 2 cm,
a = amplitud = 5 cm
     
Graf Sesaran melawan Masa
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T = tempoh = 2 s
a = amplitud = 5 cm

frekuensi, f = T-1 = 2-1 = 0.5 Hz
     
halaju, v = panjang gelombang, λ   X   frekuensi, f
v = λf
v = 2 cm X 0.5 Hz
= 2 X 10-2 m X 0.5 s-1
= 1.0 X 10-2 ms-1
 
Lihat juga
o  gelombang
o  gelombang melintang
o  gelombang membujur
 

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