Question

A simple harmonic wave is passing along the thread in the fig. from left to right. The difference in phases of reflected and refracted waves will be
a. zero
$b. \: \pi$
$c . \: \pi \div 2$
$d. \: \pi \div 4$
give reason of your answer too


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Answer 1

Answer:

what is this question l can't understand l think I don't know

Answer 2

Answer:

Thr correct option is B i.e π