L13 Waves on Strings (Unit 1 Physics BTEC Applied Science)

This Pearson BTEC Applied Science Unit 1 Physics PowerPoint covers waves on strings, including tension, mass per unit length, wave speed, fundamental frequency and harmonics.

Designed for the Waves in Communication topic, this comprehensive lesson develops students’ understanding of how transverse waves travel along stretched strings and the factors affecting their speed and frequency. Mass per unit length, also known as linear density, describes the mass of a string per metre, while tension is the pulling force acting along the string.

The PowerPoint includes a starter activity with answers, clearly defined learning objectives, key scientific terminology, detailed explanations and step-by-step worked examples. Students learn to calculate mass per unit length (μ = m/L) and apply the string-speed equation (v = √(T/μ)), including rearranging equations to determine tension and linear density.

The lesson explores fundamental frequency and harmonics, explaining how stationary waves form on strings fixed at both ends. Students learn to calculate fundamental frequency using f₁ = (1/2L)√(T/μ) and investigate how vibrating length, tension and mass per unit length influence frequency and musical pitch.

Applications to stringed musical instruments demonstrate how changing string length, tension and thickness produces different notes. Students also explore harmonic frequencies and why wave speed remains constant across different harmonics of the same string.

The resource includes practical guidance for investigating stationary waves on strings, alongside structured calculations, practice activities and 12 Check Your Understanding questions with answers, supporting assessment, consolidation and exam preparation.

This resource is suitable for classroom teaching, practical investigations, independent learning and revision for students studying Pearson BTEC Applied Science Unit 1 Physics.

File format: Editable PowerPoint (.pptx), allowing teachers to adapt the content to their teaching requirements.

Resource date: October 2026.