Edexcel IGCSE Physics 3.7 Wave equations in context
Practise applying wave equations to sound and electromagnetic waves, choosing the right distance, speed and unit conversions in context.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- calculate wavelength or frequency for radio waves, x-rays, CMBR or sound using v = fλ
- apply speed = distance/time to echo paths, doubling the device-to-wall distance when needed
- describe how sound speed in air changes with temperature from a stated relationship
3.7 Wave equations in context question 1
[Maximum number: 2]
This question is about sound waves.
A buzzer is an electrical device that produces sound.
The frequency of sound produced by the buzzer is 1400 Hz .
Sound travels at a speed of 340 m/s in air.
Calculate the wavelength of the sound wave from the buzzer.
wavelength = ............ m
- substitution or rearrangement
- evaluation
Example:
- 340 = 1400 x wavelength, or wavelength = v / f
- wavelength = 0.24 m
Accept:
- 0.243, 0.242857..., etc.
- 0.242
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