Year 10 - Science
Representing longitudinal waves
Measuring waves
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers wave motion, including amplitude, wavelength, frequency, and velocity. It explains transverse and longitudinal waves, reflection, and absorption. The focus is on measuring wave speed, and sound interactions, applying formulas, and conducting accurate experiments.
Lesson Summary
You will learn to interpret and sketch graphs of longitudinal waves.
Key Notes
- In a longitudinal wave, the oscillations / vibrations are in the same direction in which the wave travels.
- Displacement is the distance one part of a wave is moved away from its rest position.
- In a longitudinal wave, forwards displacement is positive and backwards displacement is negative.
- Wavelength of a longitudinal wave is the distance between one compression (or rarefaction) and the next.
Vocabulary To Learn
- longitudinal wave: each part of a longitudinal wave oscillates forward and backward in the same direction in which the wave moves.
- compression: part of a longitudinal wave in which parts of the wave are squashed closer together is called a compression.
- rarefaction: part of a longitudinal wave in which parts of the wave are spaced further apart is called a rarefaction.
- wavelength: the wavelength of a longitudinal wave is the distance along the wave between one compression and the next.
- amplitude: the amplitude of a longitudinal wave is the maximum distance each part of the wave moves forward or backward.
Common Mistakes To Avoid
- Particles in a longitudinal wave move forward and backward between one compression and the next.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
In a longitudinal wave, the oscillations / vibrations are in the same direction in which the wave travels. Displacement is the distance one part of a wave is moved away from its rest position.
2. Define this scientific word and use it in context. 'longitudinal wave'
each part of a longitudinal wave oscillates forward and backward in the same direction in which the wave moves. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Particles in a longitudinal wave move forward and backward between one compression and the next. Correction: Demonstrate the movement of a candle flame in front of a loudspeaker set to a very low frequency with a wavelength of about 30 m (at 10 Hz).
More Lessons In This Unit
- Human hearing Study Guide
- Measuring the speed of sound in air and solids Study Guide
- Measuring the speed of water waves from distance and time Study Guide
- Measuring water waves in a ripple tank Study Guide
- Measuring waves in a ripple tank Study Guide
- Measuring waves on a string Study Guide
- Oscilloscope Study Guide
- Probing planet Earth Study Guide
- Representing transverse waves Study Guide
- The wave equation Study Guide
- Transverse waves Study Guide
- Using the wave speed equations Study Guide
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