NCERT Exemplar I — task. Science CBSE, Class 9.

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1. Note is a sound

of mixture of two frequencies only
always unpleasant to listen
of mixture of several frequencies
of a single frequency

2. A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case

both loudness and pitch will remain unaffected
sound will be louder and pitch will also be higher
sound will be louder but pitch will be lower
sound will be louder but pitch will not be different

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