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STP Waves and Rad 213 cards
Tagged as: economics, communications, nursing, physics, chemistryCopy deck
Sun beds, invisible ink, security coding.
Heaters, optical fibres, remote controls.
Communications (e.g. to satellites), heating food (it heats from inside out heating water molecules).
Communications, longer waves can reflect off part of the atmosphere (the ionosphere).
They can carry much more info (shorter wavelengths carry more). Also due to total reflection all the info stays in the fibre so it is more secure.
Violet light (red light refracts the least).
Analogue is a continuous wave. It can suffer a lot of interference. Digital is a sequence of pulses (either 1 or 0). They suffer less from interference and the signal can be easily 'cleaned' by a regenerator. Examples are e-mail, mobile phones, modern TV's.
Frequency x wavelength (hertz, Hz) (metres, m)
A small central nucleus containing protons and neutrons surrounded by electrons.
Protons and electrons.
Atoms with same of protons but different numbers of neutrons.
Alpha (α) (a helium nucleus), beta (β) (a high energy electron) and gamma (γ) 9high frequency EM radiation).
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