Source — Science definition
Object initiating the sound disturbance.
Where it is taught
- Sound Sources, Vibrations & Receivers — Waves, Sound & Light, Physical Science: Matter, Forces & Energy, Grade 8
In use
A source is the vibrating object producing the disturbance, and a receiver is the object that responds elsewhere.
Sound Sources, Vibrations & Receivers
Questions using source
Problem 1
Answer and explanation
No. The motion can be too fast or small to detect with the chosen method. A suitable measurement or record is needed.
No. The motion can be too fast or small to detect with the chosen method. A suitable measurement or record is needed.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 2
Answer and explanation
The intermediate medium and interactions, and how the receiver responds. The picture should also identify limits such as scale and omitted biological detail.
The intermediate medium and interactions, and how the receiver responds. The picture should also identify limits such as scale and omitted biological detail.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 3
Hints
Distinguish the observed quantities, the proposed mechanism and its conditions.
Answer and explanation
Both have frequency 200 Hz; amplitude doubles. Frequency-related pitch is comparable in the simple model, while received loudness also depends on distance, medium and receiver. The amplitude comparison alone does not fix a person’s perception.
Both have frequency 200 Hz; amplitude doubles. Frequency-related pitch is comparable in the simple model, while received loudness also depends on distance, medium and receiver. The amplitude comparison alone does not fix a person’s perception.
Problem 4
Answer and explanation
Period 0.2 s; frequency 5 Hz; amplitude 3 mm; peak-to-trough span 6 mm. The source moves locally rather than traveling across the sound path.
Use matching-peak separation for period and its reciprocal for frequency.
Measure amplitude from the middle position to a peak.
Period 0.2 s; frequency 5 Hz; amplitude 3 mm; peak-to-trough span 6 mm. The source moves locally rather than traveling across the sound path.
Response criteria
- Use the named labels, directions or supplied quantities accurately.
- Connect the visual evidence to the scientific mechanism or calculation.
- State the relevant model conditions or limitation.