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describe the energy transfers by a stationary wave
no net energy transfer
→ progressive waves travel in opposite directions
describe the differences in amplitude between a progressive and stationary wave
progressive wave
constant amplitude
stationary wave
fluctuating amplitude
zero amplitude at nodes
maximum amplitude at antinodes
describe the phase differences for stationary waves
if two points are separated by zero or an even number of nodes
they reach their maximum and minimum displacements at the same time → they are in phase
if two points are separated by an odd number of nodes
one reaches its maximum displacement as the other reaches its minimum displacement → they are in antiphase
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