Waves & Radiation Flashcards
a source, use, danger + detector of radio
electronic circuits
communications, radio, TV
safe (unless very concentrated)
aerial
a source, use, danger + detector of IR
electronic devices, warm objects, stars/the sun
security lighting, TV remotes
burning ( if concentrated )
electronic detectors, heat sensitive paper, black bulb thermometer
equation to calculate A using Ao and n
A = Ao/2^n
what colour has the longest wavelength at?
red at 650nm
how can the accuracy of recording the frequency determined by the student be improved?
measure the time for more waves that pass/
count the number of waves for a longer period of time/
repeat the measurement and average
measurement of equivalent dose rate
Sv-1
what colour has the shortest wavelength at?
violet at 400nm
the colours of visible light are?
ROY G BIV
a source, use, danger + detector of x-ray
very fast electrons hitting a metal target
imaging bone fractures
cell destruction/mutation + cancer
photographic film
a source, use, danger + detector of gamma
radioactive nuclei decaying
medical tracers, killing cancerous cells, sterilising surgical eqpt.
cell destruction, mutation + cancer
photographic film, GM tube
a source, use, danger + detector of visible light
electronic devices/ LEDs, the sun
seeing, photography, optical fibres, laser surgery
burning, blindness if concentrated
eyes, photographic film, LDRs
define: activity
(nuclei) decay(s) per unit time
a source, use, danger + detector of microwave
electronic circuits
communications, satellites, heating water + food, telephones
burning if concentrated
aerials
a source, use, danger + detector of UV
sun, gas discharge, lamps
suntan lamps, making vitamin D, killing bacteria in treatment of water
sometimes glows, photographic film
equation to calculate Ao using A, n
Ao = A x 2^n
equation to calculate n using t, t1/2
n = t/(t1/2)
the EM spectrum in order from largest wavelength to shortest
radio, microwave, IR, visible, UV, Xray, gamma
the EM spectrum in order from least energy to most
radio, microwave, IR, visible, UV, Xray, gamma
the EM spectrum in order from highest frequency to lowest
gamma, Xray, UV, visible, IR, microwave, radio
Ionisation occurs when an atom loses
an electron
for a fixed mass of gas at a constant volume the pressure is
directly proportional to temperature in K
the energy of a water wave depends on its
amplitude
a ray of light travelling from glass to air, sometimes/always changes direction and sometimes/always changes speed.
the direction SOMETIMES changes
the speed ALWAYS changes
Does gamma radiation produce greater ionisation (density) than alpha
No.
