ASPhysicsOCRRevision Notes4. Electrons, Waves & PhotonsLongitudinal & Transverse WavesThe Wave Equation

The Wave Equation (OCR AS Physics): Revision Note

Exam code: H156

Katie M

Written by: Katie M

Reviewed by: Caroline Carroll

Updated on

The Wave Equation

  • The wave equation links the speed, frequency and wavelength of a wave

  • This is relevant for both transverse and longitudinal waves

 

Wave equation, downloadable AS & A Level Physics revision notes

  • The wave equation shows that for a wave of constant speed:

    • As the wavelength increases, the frequency decreases

    • As the wavelength decreases, the frequency increases

 

Frequency and wavelength, downloadable AS & A Level Physics revision notes

The relationship between frequency and wavelength of a wave

Worked Example

The wave in the diagram below has a speed of 340 m s–1.

WE - Wave equation question image, downloadable AS & A Level Physics revision notes

What is the wavelength of the wave?

Answer:

Worked example - wave equation, downloadable AS & A Level Physics revision notes

Examiner Tips and Tricks

You may also see the wave equation be written as c = fλ where c is the wave speed. However, c is often used to represent a specific speed - the speed of light (3 × 108 m s-1). Only electromagnetic waves travel at this speed, therefore it’s best practice to use v for any speed that isn’t the speed of light instead.

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Author
Reviewer
Katie M

Author: Katie M

Expertise: Curriculum Expert

Katie has always been passionate about the sciences, and completed a degree in Astrophysics at Sheffield University. She decided that she wanted to inspire other young people, so moved to Bristol to complete a PGCE in Secondary Science. She particularly loves creating fun and absorbing materials to help students achieve their exam potential.

Caroline Carroll

Reviewer: Caroline Carroll

Expertise: Head of Content Delivery

Caroline graduated from the University of Nottingham with a degree in Chemistry and Molecular Physics. She spent several years working as an Industrial Chemist in the automotive industry before retraining to teach. Caroline has over 12 years of experience teaching GCSE and A-level chemistry and physics. She is passionate about delivering high-quality resources to help students achieve their full potential.