waves Flashcards
(25 cards)
displacement (wave)
the distance of wave from the equilibrium in a given direction
amplitude
max distance of particle of wave from the equilibrium position
wavelength
the distance btw corresponding point in 2 consecutive oscillation
equation of v in terms of f
v = f *λ
period
time taken for one complete oscillation
frequency
the number of complete oscillations per unit time
f relation to T
f = 1/T
what is progressive wave
propagation of energy
equation for intensity of light
I = P / (4πr^2)
p=power
r=distance from light source
relation of intensity with amplitude for progressive waves
I ∝ A^2
difference btw transverse and longitudinal
trans: oscillation is perpendicular to the propagation
longi: oscillation is parallel to the propagation
define Doppler’s effect
observed frequency changes to the relative motion of sound source from the oberver
fobs equation Doppler effect
f o = f * (v/ v +- vs)
similar of all electromagnetic wave
- all transvers
- move light speed c = 3*10^8
list electromagnetic waves from smallest wavelength to largest
gamma, x-ray, ultraviolet, visible lights, infrared, microwave, radio
wavelength of visible light
4 to 7 * 10^-7 m
wavelength of radio
> 0.1
wavelength of microwave
0.1 to 1 × 10−3
wavelength of infared
1 × 10−3 to 7 × 10−7
wavelength of ultraviolet light
4 × 10−7 to 1 × 10−8
wavelength of x-ray
1 × 10−8 to 4 × 10−13
wavelength of gamma ray
4 × 10−13 to 10−16
what is polarisation
transverse waves can be in multiple direction (the. world is 3D, wave all perpendicular the direction of propagation can have different oscillating pattern)
Malu’s law
I = Io * cos^2(theta)
I=intensity after polarising
io=intensity before
theta=angle btw wave and polarising filter
