# Shared Flashcard Set

## Details

Waves KO
University of Southampton Physics SKE: Waves KO
36
Physics
Not Applicable
03/20/2018

Term
 What do waves transfer?
Definition
 Waves transfer energy without transferring any matter
Term
 What is an oscillation?
Definition
 A vibrartion (something moving to and fro repeatedly)
Term
 What are the two types of wave mtion?
Definition
 Transverse, longitudinal
Term
 List examples of transverse waves
Definition
 Water waves, electromagnetic waves, waves on strings, S-waves
Term
 In a transverse wave...
Definition
 the oscillations are perpendicular to the direction of travel of the wave
Term
 List examples of longitudinal waves
Definition
 Sound waves, P-waves
Term
 Amplitude
Definition
 Maximum dispalcement from equilibrium position
Term
 Wavelength
Definition
 Distance from a point on a wave to the same point on the next wave cycle
Term
 Frequency
Definition
 Number of oscillations per second
Term
 Period
Definition
 Time for one wave cycle
Term
 Speed =
Definition
 frequency x wavelength
Term
 Frequency =
Definition
 1 / period
Term
 Medium
Definition
 the substance the wave is travelling through
Term
 Law of Reflection
Definition
 Angle of reflection = Angle of incidence
Term
 Describe the image in a mirror
Definition
 Virtual imageSame distance behind the mirror as the object is in front of it
Term
 Refraction
Definition
 When a wave crosses a boundary at an angle, if the speed changes the direction of travel changes
Term
 What happens to the speed of a wave in shallower water?
Definition
 It slows down
Term
 Does light travel slower or faster in glass/Perspex/water than in air?
Definition
 Slower
Term
 In refraction, if the waves slows down, which way does it refract?
Definition
 Towards the normal
Term
 What is the speed of light in air or a vacuum
Definition
 3 x 10 ^8 m/s
Term
 Diffraction
Definition
 Waves spreading out through a gap or round a barrier
Term
 When is diffraction most obvious
Definition
 When waves pass through a gap of about one wavelength
Term
 ich are diffracted more, long wavelengths or short wavelengths?
Definition
 Long wavelengths
Term
 For sound, higher frequency =
Definition
 higher pitch
Term
 For sound, bigger amplitude =
Definition
 louder sound
Term
 What is the range of human hearing
Definition
 approximately 20 Hz to 20 kHz
Term
 What is ultrasound?
Definition
 Sound above 20 kHz
Term
 Describe the lines that light travels
Definition
 Straight
Term
 What is a ray?
Definition
 Aline to show the direction of part of a light wave
Term
 What type of image can be seen on a screen?
Definition
 A real image
Term
 What type of image cannot be seen on a screen?
Definition
 A virtual image
Term
 What is another name for a convex lens
Definition
 Converging
Term
 What is another name for a concave lens
Definition
 Diverging
Term
 What must be true about the angle of incidence for total internal reflection to occur?
Definition
 Angle of incidence must be bigger than the critical angle (for that boundary)
Term
 Which way round is the change in speed for total internal reflection to occur?
Definition
 It happens when travelling from a slower to a faster medium
Term
 How do light/infra-red signals travel along an optical fibre
Definition
 By repeated total internal reflection
Supporting users have an ad free experience!