chp1 Flashcards
waves
a method of transport of energy from one point toa nother point without transfer of matter
transverse wave
it is a wave where the wave particles is pependicular to the wave mtion
amplitude
it is the maximum displacement moved by a point on a wave
crest
it is the point on a surface wave where the displacement of wave is at maximum
trough
it is the point on a surface wave where the displacement of wave is at minimum
longitudinal wave
it is a wave where the direction of wave is parallel to the wave motion
compression
it is a point on longitidinal wave where the turns of coil or particles are at closer
rarefaction
it is a point on longitidinal wave where the turns of coil or particles are further apart
reflection of wave
bouncing back of wave into the same medium by striking into other medium surface is called reflection
refraction of waves
when a wave enters from region of deep water to shallow water at an angle it changes its direction
diffraction of waves
the spreading of waves near an obstacle is called diffraction
time period
it is time taken for any point on a wave to complete one oscilation
what is the SI unit of timeperiod?
S second
frequency
it is defined as the the complete waves produced by source per uni of time ..it also defined as reciprocal of period
formula and si unit of frequency
FORMULA
no. of comlplete oscillations / time period
SI UNIT
Hz
wavlength λ
it is the distance b/w two successive crusts and trough in a transverse wave and two successive compressons and rarefactions in a longitidinal wave
si unit of wave lenght
m
wavespeed with si uniy with derivation
it is the distance travelled by a given point on wave
si unit is m/s
as we know speed= distance / time
V=s/t S= λ
t = 1/f
V= 1/ f x λ
V= λf
as we know v=s/t
vt=s
s= λ
λ = vt
wavefront
it is an imaginary line on a wave that joins all point in a same phase
vibratory motion
when a moving body moves to and fo abou=ut a mean position then it is called vibratory motion
periodic motion
the mtion of a wave that repeats itself in equal interval of time is called periodic motion .
displacement
the minmum ditance covered by a body is called displacement
simple harmonic motion
it occurs when the net force is dircely proptionla to the displacement of mean positoin
