# Shared Flashcard Set

## Details

IGCSE Physics Waves
IGCSE Physics Waves
35
Physics
04/20/2011

Term
 Longitudinal wave
Definition
 Oscillation is parallel to direction energy travels
Term
 Transverse wave
Definition
 Oscillation is perpendicular to directionenergy travels
Term
 Displacement
Definition
 Distance of a particle in the wave from its rest position
Term
 Amplitude
Definition
 Maximum displacement of a particle
Term
 Frequency
Definition
 Number of oscillations in one second
Term
 Time period
Definition
 Time taken for one ocillation
Term
 Frequency formula
Definition
 f = 1/TT = 1/f
Term
 Wavelength
Definition
 Distance along the wave to the next particle making the same oscillation
Term
 Wavespeed
Definition
 The speed with which the energy of the wave travels
Term
 Wave formula
Definition
 v = fλ
Term
 Diffraction
Definition
 Waves spread out after an object of opening with a size similar to the wavelength of the wave.
Term
 Electromagnetic spectrum
Definition
 Range of electromagnetic waves: radio, microwaves, infra-red, light, ultra-violet, X-ray, gamma
Term
 Law of Reflection
Definition
 Angle of incidence = Angle of reflection
Term
 Refraction
Definition
 Waves change direction when passing from one medium to another
Term
 Refractive index
Definition
 A constant which tells how much a medium refracts
Term
 Refractive index formula
Definition
 n = sin i/ sin r
Term
 Total internal reflection
Definition
 When light in a more dense medium reflects at the boundary
Term
 Critical angle
Definition
 The angle of incidence where the angle of refraction is 90°
Term
 Critical angle formula
Definition
 sinc = 1/n
Term
 Digital signal
Definition
 A signal which can be represented as a series of 1s and 0s. It can be perfectly copied.
Term
 Analogue signal
Definition
 A continuously varying signal. It degrades as it is copied.
Term
 Oscilloscope
Definition
 Apparatus which represents oscillations by a trace on a screen
Term
 Pitch and loudness
Definition
 Properties of a soundwave which are determined by frequency and amplitude
Term
 Speed of light
Definition
 All EM waves travel at 300 million m/s in a vacuum
Term
Definition
Term
 Uses of microwaves
Definition
 Cooking and satellite transmissions
Term
 Uses of infra-red
Definition
 Heaters and night vision
Term
 Uses of visible light
Definition
 Optical fibres and photography
Term
 Uses of X-rays
Definition
 internal structure of objects and medical applications
Term
 Uses of gamma rays
Definition
 Sterilising food and medical equipment
Term
 Effects of microwaves
Definition
 internal heating of body tissue
Term
 Effects of infra-red
Definition
 skin burns
Term
 Effects of infra-red
Definition
 skin burns
Term
 Effects of ultra-violet
Definition
 sunburn and blindness
Term
 Effects of gamma rays
Definition
 cancer, mutation
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