Waves in air, fluids and solids — WJEC GCSE Physics
In summary: Waves in air, fluids and solids is a key topic in WJEC GCSE Physics. Key exam tip: Always state the formula before substituting values in calculations.
Exam Tips for Waves in air, fluids and solids
- Always state the formula before substituting values in calculations.
- Ensure units are converted to standard SI units (e.g., kHz to Hz, cm to m) before calculating.
- Use clear, labeled diagrams to illustrate wave properties if asked to describe wave motion.
- Remember that the period T is the reciprocal of frequency (T = 1/f).
Common Mistakes
- Confusing the direction of particle oscillation with the direction of energy transfer in longitudinal waves.
- Incorrectly rearranging the wave equation v = fλ.
- Failing to use consistent SI units for frequency (Hz), wavelength (m), and speed (m/s).
- Assuming that all waves require a medium (forgetting electromagnetic waves).
Marking Points
- Definition of wave motion parameters: amplitude, wavelength, frequency, and period.
- Correct application of the wave equation: v = f × λ.
- Distinction between transverse and longitudinal waves with appropriate examples (e.g., water ripples vs. sound waves).
- Evidence that waves transfer energy without transferring the medium itself.
- Requirement of a medium for the transmission of sound waves.
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