Waves

Worked examples (9)

• 1State the difference (Getting started)
• 2Classify named waves (Getting started)
• 3Compressions and rarefactions (Getting started)
• 4Energy, not matter (Building confidence)
• 5Why there is no wind when you hear a sound (Building confidence)
• 6Why space is silent (Building confidence)
• 7Demonstrating both on a spring (Stretch)
• 8What a single particle does (Stretch)
• 9What both wave types share (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Match quantities to units (Getting started)
• 2Define amplitude and wavelength (Getting started)
• 3Frequency and period defined (Getting started)
• 4Read a wave diagram (Building confidence)
• 5Frequency from a period (Building confidence)
• 6Prefix conversions (Building confidence)
• 7Wavefronts (Stretch)
• 8Distance graph or time graph? (Stretch)
• 9What amplitude does and does not affect (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Direct substitution (Getting started)
• 2Find a wavelength (Getting started)
• 3Find a frequency (Getting started)
• 4Radio wavelength from MHz (Building confidence)
• 5Frequency of visible light (Building confidence)
• 6How far away is the storm? (Building confidence)
• 7Frequency and wavelength are inversely proportional (Stretch)
• 8Entering a new medium (Stretch)
• 9All EM waves, one speed (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Frequency from a period (Getting started)
• 2Period from a frequency (Getting started)
• 3Convert milliseconds first (Getting started)
• 4Read a period from a trace (Building confidence)
• 5Improving accuracy (Building confidence)
• 6Period to wavelength (Building confidence)
• 7An electromagnetic period (Stretch)
• 8Compare two waves (Stretch)
• 9Which graph gives the period? (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1What you hear as an ambulance passes (Getting started)
• 2State the changes (Getting started)
• 3Does the siren change? (Getting started)
• 4The full explanation (Building confidence)
• 5A source moving away (Building confidence)
• 6The wavefront diagram (Building confidence)
• 7Moving observer, stationary source (Stretch)
• 8Red shift and the expanding Universe (Stretch)
• 9Using the Doppler effect to measure speed (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Describe light as a wave (Getting started)
• 2Describe sound as a wave (Getting started)
• 3Compare light and sound (Getting started)
• 4An echo calculation (Building confidence)
• 5Sonar depth measurement (Building confidence)
• 6Speeds in different materials (Building confidence)
• 7Lightning and thunder (Stretch)
• 8The bell jar demonstration (Stretch)
• 9Why sound bends round corners (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Apply the law of reflection (Getting started)
• 2An angle given from the surface (Getting started)
• 3Reflection and refraction of non-light waves (Getting started)
• 4What causes refraction (Building confidence)
• 5Which way does it bend? (Building confidence)
• 6Speed, wavelength and frequency (Building confidence)
• 7Draw a reflection ray diagram (Stretch)
• 8A ray through a rectangular block (Stretch)
• 9Why a straw looks bent (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Put the spectrum in order (Getting started)
• 2Why all EM waves share one speed (Getting started)
• 3The visible spectrum (Getting started)
• 4Match uses to properties (Building confidence)
• 5Dangers and protection (Building confidence)
• 6The metal mesh in a microwave door (Building confidence)
• 7A wave-equation calculation (Stretch)
• 8Ionising or heating? (Stretch)
• 9The three principles of protection (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1Calculate a refractive index (Getting started)
• 2Find the angle of refraction (Getting started)
• 3Refraction into water (Getting started)
• 4The ray-tracing method (Building confidence)
• 5The graphical method (Building confidence)
• 6Improving accuracy (Building confidence)
• 7Why the emergent ray is parallel (Stretch)
• 8Why a semi-circular block? (Stretch)
• 9Dispersion through a prism (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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Worked examples (9)

• 1The two conditions for TIR (Getting started)
• 2Define the critical angle (Getting started)
• 3Calculate a critical angle (Getting started)
• 4Find n from a critical angle (Building confidence)
• 5Increasing the angle in a semi-circular block (Building confidence)
• 6Refractive index and critical angle (Building confidence)
• 7How an optical fibre works (Stretch)
• 8Why a 45° prism reflects (Stretch)
• 9Prisms against mirrors (Stretch)

Model answers (9)

• ✓Model answer — 4SD0/1P style
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