Opening your next discovery…
Opening your next discovery…
When a source changes frequency in the same medium, what must happen to wavelength?
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pp. 4–17 key concept and outcome tables. New IX-specific course inspected successfully. Biology topics include Cell, Tissues, Reproduction, Diversity. Broad stage competencies on preceding pages are not treated as Grade IX topic placement. Inspected scope: curriculum.
Source checked · 2026-10-21Chapter 10, §§10.3, 10.5, 10.6.1–10.6.4; printed pp. 192–198 (PDF pp. 9–15). Current body inspected for longitudinal sound, pressure graphs, frequency, wavelength, amplitude, speed and pitch. Original numerical sound wave does not claim measured loudness, real material speed or coverage of reflection and hearing. SHA-256 0ac97e4f2c0a983147f3d5a4e34df5f776f26de88fa8f4ec4e4eda2272e5f49e.
Source checked · 2026-10-21Original activities, questions, reading passages and fictional archives. A curricular connection does not make a Bodhi activity an official NCERT exercise. Broader grade adaptation awaits educator review.
Mapping under review · 2026-10-21The signal source changes pitch, but its medium stays the same. Record two frequencies at the same medium speed and amplitude. Decide whether a higher-pitched signal must travel faster, and test your explanation.
The graph is pressure at different positions. Its vertical axis does not show particles moving up and down. A sound wave is longitudinal: the orange material marker oscillates about its rest position while the pressure pattern moves. At a fixed medium speed, λ = v ÷ f and T = 1 ÷ f. Raising amplitude changes the pressure variation, not frequency.
| Trial | Frequency Hz | Amplitude | Speed m/s | Wavelength m |
|---|
What does a fair comparison of these two signal snapshots show?
The source frequency doubles from 200 Hz to 400 Hz. The medium speed stays 340 m/s. Predict the new wavelength, using λ = v ÷ f.
Original sinusoidal pressure disturbance in an ideal homogeneous medium. Speeds are selectable teaching values, not measurements for an identified material or temperature. Relative amplitude is not decibels or a calibrated loudness score. The marker displacement is exaggerated for visibility; schematic dots do not count actual molecules. Pressure and material displacement are a quarter-cycle apart. No attenuation, interference, reflection, hearing assessment or automatic audio is modelled. Snapshots advance on request, so reduced-motion users have the same controls.