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Flashcards in Superposition Of Waves Deck (9):

How are stationary waves formed ?

Stationary waves are formed by the superposition of two identical waves travelling in opposite direction.


What do you mean by 'identical wave' ?

By identical wave we mean that the waves must have the same value of v, ω and k.


What are antinodes?

Antinodes are points where amplitude of waves is maximum. ( or A1+ A2 ). Antinodes are also called points of constructive interference.


Why are nodes ?

Nodes are point where amplitude is minimum ( or A1-A2). Nodes are also called points of destructive interference.


What happens when amplitudes A1 and A2 are same or equal? ( to say A) ?

Then the amplitude at antinodes is 2A and at nose is zero. In this case points at node do not oscillate.


Which points ( Node or antinodes ) have minimum and maximum energy of oscillation ?

Points at antinodes have maximum energy of oscillations and points at nodes have minimum( Zero when A1=A2)


When are points in wave motion said to be in the same phase and when are they said to be out of phase ?

Points lying between two successive nodes are in same phase and points lying between two neighbouring successive nodes are said to be out of phase.


Why is the general eq of a stationary wave ?

y= 2A sin kx cos ωt.


What is the formula of frequency of a oscillations of a stretched wire or organ wire ?

f= n(v/2l). Using this even and odd both harmonica are obtained.
v= √T/μ=√T/pS