Cry of Jelicuon
6 / 7
Interactive Explore

Festival Instrument Pitch Explorer

Festival context —Select a festival instrument preset or slide the frequency freely. Hear the actual pitch through your speakers and watch the wavelength update in real time. Discover why the bass drum sounds so different from the trumpet — it is pure physics.

S8FE-IVb-26Grade 8 · Quarter 4Relate Frequency to Pitch

Festival Instrument Pitch Explorer

Interactive Simulator
"Select a festival instrument preset or slide the frequency freely. Hear the actual pitch through your speakers and watch the wavelength update in real time. Discover why the bass drum sounds so different from the trumpet — it is pure physics."
Festival Pitch — Frequency & WavelengthS8FE-IVb-26one wavelength λ (to scale)higher pitch → tighter wave → shorter λPITCH f → λ = 343 / fHIGHLOWMid pitchTrumpet440 Hzλ = 343 ÷ 4400.78 mTAP AN INSTRUMENT TO CHANGE THE PITCHBass Drum80 HzSnare200 HzTrumpet440 HzFlute880 Hz

Same sound speed (343 m/s) for all — only the pitch changes, so faster vibration packs a shorter wavelength.

Adjust Variables

Frequency (Hz)440 Hz
401200

Physics ReadoutsLIVE

Frequency440 Hz
Wavelength0.780 m
Perceived PitchMid (trumpet/horn)
pitch_wavelength = 343 / frequency

Community Hub — Cultural Discussion

Reflect & Connect

The Cry of Jelicuon choreographer uses different instruments to cue different emotions. Design a three-act sound map for the reenactment: which instrument (and approximate frequency) would you use for (1) the peaceful daily life opening, (2) the tense buildup before the revolt, and (3) the triumphant conclusion? Justify each choice using frequency and pitch.

Discuss with your class or write your response in your science journal.

Performance Task

Twang a Ruler to See and Hear Frequency

1Do

Hold a ruler firmly flat against the edge of a desk with most of it hanging off the edge. Twang the free end and watch and listen. Slide the ruler so LESS of it hangs off, and twang again. Repeat with shorter and shorter overhangs.

2Measure

For each overhang length, note (a) how fast the free end visibly vibrates and (b) whether the pitch you hear is low or high. Record overhang length next to its pitch (low / medium / high).

3Reflect

A shorter overhang vibrates faster — higher frequency — and you hear a higher pitch: you can both see and hear that pitch tracks frequency. That is competency S8FE-IVb-26. The number of vibrations per second IS the frequency, and λ = 343 ÷ f means the high-pitch twang also makes the shortest sound wavelength. In the Cry of Jelicuon, this is why the deep bass drum (low f) and the sharp trumpet (high f) sound so different. Which ruler length behaves like the bass drum, and which like the trumpet?

Record your measurements and reflections in your science journal.

Module Overview

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Check Your Understanding: Waves & Sound