electromagnetic spectrum
Overview
This lesson introduces the electromagnetic spectrum, a continuous range of all possible frequencies of electromagnetic radiation. We will explore the common properties shared by all electromagnetic waves and differentiate between the various regions based on their wavelength, frequency, and practical applications.
Introduction to Electromagnetic Waves
Electromagnetic (EM) waves are unique in that they do not require a medium for propagation; they can travel through a vacuum. They are formed by the oscillation of electric and magnetic fields, which are perpendicular to each other and to the direction of wave propagation, making them **transverse w...
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Key Concepts
- Electromagnetic Wave: A wave that consists of oscillating electric and magnetic fields, propagating through space at the speed of light.
- Electromagnetic Spectrum: The entire range of wavelengths or frequencies of electromagnetic radiation, extending from gamma rays to radio waves.
- Wavelength (λ): The spatial period of a periodic wave, the distance over which the wave's shape repeats.
- Frequency (f): The number of complete cycles of a wave that pass a point in one second.
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Exam Tips
- →Memorise the order of the EM spectrum (Radio to Gamma) and the approximate wavelength/frequency ranges for each region. A mnemonic can be helpful.
- →Be able to state at least two uses and one potential hazard for each region of the EM spectrum. Focus on specific examples.
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