2. What is a wave?
A wave is a disturbance which travels
through a medium nd transfers energy from
one point to another without causing any
permanent displacement of the medium
itself
Transverse: Direction is perpendiculr to the
direction of vibration of the medium eg
plucking a string
Longitudinal: Direction is same as direction of
the vibration of the medium eg sound waves.
3. Amplitude: maximum displacement of particles
from their mean position measured in m.
5. Equation of a travelling wave
y = sin θ
y = cos θ
Angular velocity ω = θ/t θ = ωt
y = sin ωt
y = cos ωt
y = a sin (ωt – Ф) Ф is wave constant for
wave that did not start from origin.
6. Ф = 2πx/λ *relating Ф to x
y = a sin (ωt – 2πx/λ)
y = a sin (2πt/T - 2πx/λ)
y = a sin 2π (t/T – x/λ)
y = a sin 2π/λ (λt/T – x) a sin 2π/λ (1/T
λt– x)
f = 1/T
a sin 2π/λ (f λt – x)
v = fλ
a sin 2π/λ (vt – x)
7. Difference btw progressive waves
and stationary waves
Progressive: All waves whether transverse or
longitudinal are progressive waves
Stationary: When 2 progressive waves of
equal amplitude and frequency travelling in
opposite directions combine.
8. Properties of waves
Can be:
Reflected
Refracted
Diffracted
Polarized
And exhibit interference
