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Question
Which equality relates AE to the distance advanced by the wavefront from B to C?
Options
\[AE=BC=\tau/v\]
\[AE=BC=v\tau\]
\[AE=BC=v/\tau\]
\[AE=BC=v+\tau\]
MCQ
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Solution
AE is a radius of the sphere drawn from A, while BC is the distance advanced in time \[\tau\]. Both equal \[v\tau\].
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