Flashcards
Electromagnetic Waves
Cards in this deck (10)
- 1Properties of EM waves (that other waves have)Transverse
Can be plane-polarised
Can be reflected
Can be refracted
Can be diffracted - 2Properties of EM waves (that other waves do not have)Do not need a medium to travel (they can travel in a vacuum)
Oscillate in two planes - the electric plane and the magnetic plane - 3Name the regions of the electromagnetic spectrum and their respective wavelengths (longest to shortest wavelengthsRadio waves: \(10^{-1}\)m and larger
Microwaves: \(10^{-1}\)-\(10^{-3}\)m
Infra-red: \(10^{-3}\)-\(10^{-7}\)m
Visible light: \(400\)-\(700\)nm
Ultra-violet: \(10^{-7}\)-\(10^{-8}\)m
X-rays: \(10^{-8}\)-\(10^{-12}\)/\(10^{-13}\)m
Gamma rays: \(10^{-12}\)/\(10^{-13}\)m and smaller - 4What are the 7 colours that visible light are divided into? (longest-shortest wavelength)Red
Orange
Yellow
Green
Blue
Indigo
Violet - 5What is the wave-speed equation for electromagnetic waves?\[c=f\lambda\]
- 6What is the refractive index \(n\) of a material?The ratio between the speed of light in a vacuum \(c\) and the speed of light in the material \(v\)
\(n=\frac{c}{v}\) - 7State Snell's Law (both types)\(n\sin{\theta}=k\)
\(n_1\sin{\theta_1}=n_2\sin{\theta_2}\) - 8Explain what is meant by total internal reflectionWhen light meets a boundary at a large angle to the normal, it is totally internally reflected - all of the light is reflected back into the original medium and no energy leaves the diamond
- 9State the two conditions for total internal reflection1. Light must be travelling through a medium with a higher refractive index when it strikes the boundary with a medium with a lower refractive index
2. The angle at which light strikes the boundary must be above the critical angle - 10How is the critical angle calculated?Air: \(\sin{C}=\frac{1}{n}\)
Other media: \(\sin{C}=\frac{n_2}{n_1}\) where \(n_1>n_2\)
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- A-level OCR Physics A-level (Topic 4 - Electrons, waves and photons) Flashcards on Electromagnetic Waves, created by James Norman on 07/02/2019.
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- James Norman
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