waves Flashcards
what do waves transfer
energy without transferring mass
what is period and symbol for it
time taken for one wave T
what is eqation relating frequency and period
𝑓 = 1/ T
equation for speed of wave
v = f x λ
high point in wave and lowest point in a wave in maximum displacement
crest trough
diff between transverse and longutidan waves
transverse ossilications are up and down and perpendicular to movement
in longitudinal waves oscillations are front and back and parallel to direction of movement
eg of transverse wave 3
long 2
electromagnetic waves a s seismic waves water waves
sound and p seismic
what happens to speed of wave when going from deep to shallow
from shallow to deep
decreases
increases
in diffraction what happens if you increase gap
decrease diffraction
in diffraction what happens if you increase wavelength
increase diffraction
when light is going through denser medium
less dense medium
where does it bend
towards normal
away from normal
what does speed of light in vacuum/
speed of light in medium equal?
refractive index
how to n refractive index using sin c critical angle
1/sin c
what is critical angle
angle of incidence which makes angle of refraction 90 so makes refracted angle on the surface
total internal reflection def
all light rays are reflected in the same more dense medium without any refraction
condition of TIR total.. 2
light travels from more dense to less dense
angle of i greater than c
what is
principal focus
focal length
the point in which light is brough to by a lens
distance between principal focus and center of lens
when object is from infinity image is at … and 3 characteristics
when object at f1 image is at
F it is real inverted and very small
infinity
when is image is behind the object and virtual and vertical
in focal length between between f and center of lense
what happens to size as the object is getting closer to the lens
gets larger
size of object
beyond 2F
at 2f
between 2F F
very small
same size
enlarged
what happens to white light when they pass through a prism
they get dispersed into a spectrum
colour with
largest frequency
smallest frequency
red
violet
uses of microwave 3
infrared
light
bluetooth phone calls wifi
aircon remove control
optical fibre
diff between analogue signal and digital
analogue changes frequency and smplitude with time
digital is obly 0 or 1
advantages of digital 5 kinda 3 though
can remove unwanted signals (regeneration)
better capacity and quality
can be stored processed by computers
how do sound waves travel
by passing on vibration from one particle to the next
what are ultrasounds
sound waves with frequency larger than 20kHz
uses of echo
radar and echo sounder that measures depth if water under boat
radar uses microwaves noty sound
