Wireless communication- physics gcse

Radiowaves- summary

Radiowaves are part of the electromagnetic spectrum, and they have the largest wavelength out of all of the electromagnetic waves. The waves in the electromagnetic spectrum go in the following order, with waves of the largest wavelengths listed first:

• Radiowaves: Wavelength- (1m-10^4)
• Microwaves: Wavelength- (10^-2)
• Infrared: Wavelength- (10^-5)
• Visible light: Wavelength- (10^7)
• UV rays: Wavelength- (10^-8)
• X-rays: Wavelength- (10^-10)
• Gamma rays: Wavelength- (10^-12)

Radiowaves have a wavelength of 1m-10^4 (1 metre - 10 to the power of 4)

FACT: The waves at each end of the spectrum tend to pass through objects, whereas waves in the middle section of the spectrum tend to be absorbed. This is why radiowaves are so good for wireless communication, as they do not get absorbed so easily.

Wireless communication with RadiowavesAs mentioned just before, radiowaves are at the end of the spectrum, and so they are less likely to be absorbed. The fact that they are less likely to be absorbed means that they can travel through the earths atmosphere. This is because of their long wavelength. To calssify as a radiowave, the waves wavelength must be longer than about 10cm. longer wavelengths are easier to transmit and be recieved from long distances. Longer wavelengthed waves can be transmitted and recieved in different…