Waves in communication Flashcards
What is refraction?
The bending of light as it passes from one median to another with a different density
What is Snells law?
states that the ratio of the angle of incidence to the angle of refraction of a wave as it travels through a boundary between two media is a constant termed the refractive index N
What is the total internal reflection?
When light hits a boundary at an angle greater than the critical angle and reflects within the medium
What is fibre optics?
Glass or plastic fibres used to transmit light signals with minimal loss
How are optical fibres applied?
Light signals travel over long distances with low signal loss
How is signal transmission applied?
Efficiently used in internet data transfer and networking
What are the wave properties in communication?
Amplitude
Frequency
Wavelength
Speed
All affect how signals propagate
Describe gamma rays?
High frequency
High energy radiation use in cancer treatment
Describe x-rays?
Used in medical imaging
Penetrates soft tissue
Describe UV light?
Applications in sterilisation
Tanning
Studying fluorensence
What is visible light?
The range of electromagnetic waves detectable by the human eye
How is visible light used?
Used for vision
Photography
Optical devises
Signalling
Describe Infrared
Used in remote controls
thermal imaging
data transmission over short distances
Describe microwaves
Used in cooking
satelite communications
radar
Describe radio waves
Low frequency waves
used In radio
tv broadcasting
long distance communication
What is intensity?
The power per unit area of a wave
Measured in watts per square
What are the factors affecting intensity?
Distance from source and medium of propagation
What’s the importance of intensity?
Determines the strength of a signal in communication systems
What are analogue signals?
Continuous waves that vary in amplitude and frequency
What are digital signals?
Discrete signals that use binary for information transfer
Compare analogue and digital signals
Digital signals are less susceptible to noise and interference compared to analogue
What are communication channels?
The medium used to transmit a signal from sender to receiver
What are the types of communication channels?
Physical media like copper wires
Wireless channels
