Frequency range of the spectrum — WJEC GCSE Physics
In summary: Frequency range of the spectrum is a key topic in WJEC GCSE Physics. Key exam tip: Memorize the order of the spectrum (Radio, Microwave, Infra-red, Visible, Ultraviolet, X-rays, Gamma rays) and know how wavelength and frequency change across this order.
Exam Tips for Frequency range of the spectrum
- Memorize the order of the spectrum (Radio, Microwave, Infra-red, Visible, Ultraviolet, X-rays, Gamma rays) and know how wavelength and frequency change across this order.
- Remember that while speed is constant in space, frequency and wavelength vary inversely.
- Be prepared to identify the visible spectrum range (red to violet).
Common Mistakes
- Confusing the order of the electromagnetic spectrum (e.g., mixing up the relative positions of X-rays and gamma rays)
- Incorrectly stating that electromagnetic waves are longitudinal
- Assuming all electromagnetic waves have the same frequency or wavelength
- Failing to mention that electromagnetic waves transfer energy
Marking Points
- Identification of electromagnetic waves as transverse
- Recognition that all electromagnetic waves travel at the same velocity in a vacuum/space
- Ability to list the electromagnetic spectrum in order of wavelength or frequency
- Understanding that electromagnetic waves transfer energy from source to absorber
- Recognition that human eyes can only detect a limited range of the spectrum
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