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प्रश्न
Figure shows four waves A, B, C, and D
Name the wave which shows
(a) a note from a musical instrument,
(b) a soft note
(c) a shrill note.
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उत्तर
(a) a note from a musical sound is shown by (D)
(b) a soft note is shown by (A)
(c) a shrill note is shown by (C)
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