Physics random stuff Flashcards
(26 cards)
is the mains a.c. or d.c.
a.c.
are batteries or cells a.c. or d.c.
d.c.
which way does current flow
from positive to negative
which way do electrons flow
from negative to positive
are the oscillations of transverse waves parallel or perpendicular to direction of wave
perpendicular
are the oscillations of longitudinal waves parallel or perpendicular to direction of wave
parallel
what type of wave is sound
longitudinal
what type of wave is light
transverse
simple definition of doppler effect
when the wavefronts are bunched or spaced apart
what changes when a wave is refracted
the wavelength and velocity
what type of waves are the electromagnetic waves
transverse (they are forms of light)
radiowaves uses and wavelength
- radio and television communication
- have a long wavelength
microwaves uses and wavelength
- satellite transmissions and cooking
- shorter wavelength and larger frequency
infrared radiation uses and hazards
- heaters and night vision
- skin burns
visible light uses
fibre optics and photography
ultraviolet light uses and hazards
- fluorescent lamps
- increases risk of skin cancer and blindness
x rays uses, wavelength and hazards
- security and medical imaging
- short wavelength and high frequency
- form of ionising radiation which could cause cell mutations and cancer
gamma rays uses and hazards
- medical equipment and sterilizing food
- ionising radiation - mutations - cancer
what is conduction
thermal energy transferred by the particles vibrating and hitting other particles
what is convection
molecules in a fluid flowing from a high to low thermal energy area
boyles law
p1 x V1 = p2 x V2 and p1/T1 = p2/T2
does a step-up transformer have more or less turns on the secondary than the primary
more - meaning the secondary has higher voltage
does a step-down transformer have more or less turns on the secondary than the primary
less
relative mass of an electron
1/1850
