## Tuesday, May 5, 2009

### Wavelength and Frequency

The frequency of a wave is defined as the number of waves created per second. As the waves propagate away from the source, the frequency also represents the number of waves that will pass a point per second. The unit of frequency is the hertz (Hz).

Frekuensi adalah jumlah gelombang yang tercipta dalam 1 saat.

The wavelength, or length of a wave, is defined as the distance from one point on a wave to the corresponding point on the next wave. Since wavelength is a distance, the unit of wavelength is the meter (m).

Wavelength atau panjang gelombang ditafsirkan sebagai jarak dari satu point pada gelombang ke point untuk gelombang yang lagi satu.

Frequency, wavelength and speed are related by the equation:

c =  f

where c is the speed of light (3 x 108 m/s),
 (lambda) is the wavelength in meters (m),
and f is the frequency in hertz (Hz).

From this equation we can see that a long wavelength will have a low frequency while a short wavelength will have a high frequency since the product of these two quantities is constant.

Dari persamaan diatas kita boleh simpulkan long wavelength akan mempunyai frekuensi yang rendah(low frequency) manakala short wavelength akan mempunyai high frequency

Click for larger photo..

Wave #1 has 5 complete waves passing by in one second, while Wave #2 has 10 waves passing by in the same time. If you were to watch Wave #1 pass a point, the frequency would be 5 waves per second – 5 Hz. Wave #2 would have a frequency of 10 hertz. Wave #1 has half the frequency of Wave #2 and two times the wavelength. For both waves, the product of the wavelength and frequency are the same.

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