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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
What is the base frequency if a pipe gives notes of frequencies $425, 255$ and $595$ and decide whether it is closed at one end or open at both ends
  • A
    $17,$ closed
  • ✓
    $85,$ closed
  • C
    $17,$ open
  • D
    $85,$ open
✓

Answer

Correct option: B.
$85,$ closed
b
(b) Let the base frequency be n for closed pipe then notes are $n,\;3n,\;5n.....$
$ \therefore$ note $3n = 255$ ==>$n = 85$, note $5n = 85 \times 5 = 425$
note $7n = 7 \times 85 = 595$

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