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When a wave travels from a denser to rarer medium, then

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wavelength of wave decreases

there is no change in phase angle

amplitude of wave increases

speed of wave increases

answer is A, C, D.

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Detailed Solution

$F r e q u e n c y o f t r a n s m i t t e d w a v e d o e s n o t c h a n g e, v e l o c i t y o f t r a n s m i t t e d w a v e w a v e (v_{2}) i n c r e a s e s (v_{2} > v_{1}) .$

Now , $A_{t} = \frac{2 v_{2}}{v_{2} + v_{1}} A_{i}$

${If v}_{2} > v_{1}, A_{t} > A_{i}$

Since v= $ν λ a n d ν r e m a i n s u n c h a n g e d, λ i n c r e a s e s .$

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