AIIMS 2018 Physics Wave Reflection Assertion Reason Question
Assertion: A string wave traveling towards a free end changes its direction of motion but phase remains constant after reflection.
Reason: When string wave reaches the free end there is no medium present in front of it
Both assertion and reason are true, and reason is the correct explanation for assertion.
Both assertion and reason are true, but reason is not the correct explanation for assertion.
Assertion is true, but reason is false.
Both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because when a wave reflects off a free end, it indeed changes direction while maintaining its phase, resulting in an inversion of the wave. The reason is also true, as at the free end of the string, there is no medium to reflect the wave back, allowing it to change direction without any additional phase shift. Option B is incorrect because the reason does explain the assertion; option C is incorrect as both statements are true; and option D is incorrect since both statements are valid. Understanding wave behavior at boundaries is crucial in wave mechanics, particularly in contexts like sound and light propagation.
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