Waves Flashcards
What is the difference in transverse wave and longitudinal wave
T: Oscillation is perpendicular to the direction of travel.
L: Oscillation is parallel to the direction of travel
What is polarisation?
Restriction of vibration, in a single plane
Polarisation occurs only in….
Transverse wave
Why is diffraction grating better than 2 slit interference for calculating a precise wavelength?
brighter images and large angles can be used
How a stationary wave formed?
The superposition of two progressive waves with same frequency that are moving in opposite direction
Why stationary wave do not transmit energy?
Progressive wave transmit energy in opposite direction so they cancel out. Hence no net energy transfer
What is a progressive wave?
A wave transfers energy from one point to another without transferring material
can longitudinal wave interfere?
yes
when does TIR occur
incidence is greater than critical
n1>n2
What is meant by modal dispersion?
parts of pulse take different times to travel through the fibre
due to entering the fibre at a different angle
state all the EM waves: lowest to highest frequencies
radiowaves, microwaves, infrared, visible, ultraviolet, x rays and gamma rays
does red have longer wavelength than blue, red
true
what interference occurs at antinodes
constructive
what interference occurs at nodes
destructive
what interference occurs at nodes
destructive
