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A heavy string X is joined to a light string Y at point O. How will a pulse get reflected (1) travelling on the string X towards O (2) travelling on the string Y towards O ? |
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Answer» (1) A pulse travelling on a heavy string will reflect without inversion at its boundary with a lighter string. Thus, a crest will reflect as a crest and a trough will reflect as a trough. (2) When a pulse travelling on a light string encounters a boundary with a heavier string, the reflected pulse is inverted. Thus, a crest will reflect as a trough and vice versa. |
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