physics practical spring 1 Flashcards
what is transferred through waves
energy not particles
aptitude of a wave
the maximum displacement of a point on the wave from its undisturbed postion ( on a graph its height )
Wavelength
distance between the same point on two adjecent waves
Frequency
number of complete waves passing through a certain point per second (mesaured in hertz)
Transverse waves
have perpendicular vibrations to the direction which the wave is propagated
Longitudinal waves
vibrations are parell to the direction that the wave is propogated
Wave speed
speed at which energy is being transferred
Equation for wave speed
V= f times lamda(wave lenght)
reflection
when a wave bounces back
normal
a imagirary line thats perpendicular to the surface at the point of indicence
Angle of indecence
the angle between the incoming wave and the normal
angle of reflection
the angle between the reflected is the angle between the reflected wave than the normal
refraction
is when a wave changes direction when it crosses a boundary between two materials at an angle to the normal this happens because the wave changes speed
refractive index
the ratio of the speed of light in a vacum to the peed of light in the material
the higher the refractive index
the slower the speed of light
critical angle
is the angle of incedence on a boundary that will cause the angle of refraction to be 90 degrees and angle of indedence great than the critical angle will cause total interal refraction
diffraction
when a wave spreads out as the bends round obsticles
ciritical angle equation
n= 1
sin c
converging lenses
bring paralells rays to a focus
prinicipal axis
a straight line passing through the middle of the lens
principal focus
when rays hitting the lens parallel to the axis all meet
three rules for refraction in a converging lens
1 indecent ray parallel to the axis refracts through the lens and passes through the principal focus on the other side(straight until the middle of the lens then go through the dot on the other side)
2 an incident ray passing through the center of the lens carries on in the same direction (go straight through the middle of the lens)
3 an incident ray passing through the principal focus refracts through the lens and travels parallel to the axis.(go through the dot and then go straight when reach middle of lens)
diverging lens
makes parallel rays spread out
whats a common use of virtual image
magnifying lens
white light is made up of
7 diffrent colors
triangular prisims
disperse white light
monochromatic light
is made up of waves that all have the same frequency
frequency and wave length are
inversly proportional
How to find speed of sound wave
d/t
loudness increases with
amptitude
the higher the frequency
the higher the pitch
which way does the wave bend when going from dense to less dense
turns away from normal
which way does the wave bend when going from less dense to dense
turn toward normal
what color light has the highest frequency and shortest wavelength
violet
what color has the lowest frequency and longest wavelenght
red
what will happen if the angle of incidence is less than the critical angle
most of the wave will be refracted but some will be reflected
