waves Flashcards
(34 cards)
what does light do when it hits a shiny surface
it reflects
where are the angles of incidence, reflection and refraction measured
in between the ray and the normal
what is the normal
a dashed line drawn at 90° to the surface
the law of reflection
angle of incidence = angle of reflection
what are the three primary colours
red green and blue
what are the secondary colours
magenta yellow and cyan
how do you make white light
mix all three primary colours
what is refraction
light changing speed and wavelength (and sometimes direction) when it enters a different material
what is total internal reflection
when the angle of incidence is above the critical angle, the ray of light will fully reflect back in the material
are convex lenses used to correct long or short sight
long
are concave lenses used to correct long or short sight
short
what way do convex and concave lenses redirect light
convex goes in and concave goes out
what do waves transfer
energy
what is the highest part of a wave called
crest/peak
what is the lowest part of a wave called
trough
what is the distance from the crest or trough of a wave to the middle line called
amplitude
what way to the vibrations occur in a transverse wave
90° to the direction the wave is travelling
what way to the vibrations occur in a longitudinal wave
they occur in the same direction the wave is travelling
what is frequency
the number of waves that pass a point per second
f=N/t
frequency (Hz) = number of waves / time (s)
what is the period of a wave
how long it takes one wave to pass a point
f= 1/T
frequency (Hz) = 1 / period (s)
v= fλ
speed (ms^1) = frequency (Hz) wavelength (m)
what are the 3 things all waves do
reflection, refraction and diffraction
