Sound Sources, Vibrations & Receivers — Drills · Grade 8 Science
Chapter: Waves, Sound & LightWhat these drills covers
By the end of Sound Sources, Vibrations & Receivers you should be able to:
- I can read source vibration records and distinguish amplitude, frequency and pitch.
- I can explain energy transfer from a source through matter to a receiver and qualify a loudness prediction.
4 questions, written answer, each with a worked explanation.
Vocabulary used: vibration, source, receiver, amplitude, frequency, model, evidence, system boundary, assumption.
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
Amplitude is 3 mm. The cycle count per time, and hence frequency of 200 Hz, is unchanged in this comparison.
Amplitude is 3 mm. The cycle count per time, and hence frequency of 200 Hz, is unchanged in this comparison.
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
Answer and explanation
Frequency needs the number of complete cycles divided by a defined time. An unscaled drawing alone does not establish hertz.
Frequency needs the number of complete cycles divided by a defined time. An unscaled drawing alone does not establish hertz.
Response criteria
- Use the supplied conditions and relevant evidence.
- Explain the scientific mechanism or calculation.
- State a meaningful limitation or testable next step.
Problem 4
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.