# Shared Flashcard Set

## Details

Waves, Light and Sound
-
35
Physics
Not Applicable
03/30/2018

Term
 Waves transfer energy without transferring any matter.
Definition
Term
 Oscillation?
Definition
 Vibration (Something moving to and fro repeatedly)
Term
 Wave types?
Definition
 Transverse and Longitudinal
Term
 Example of transverse waves include....
Definition
 Water waves Electromagnetic waves Waves on strings S-waves
Term
 In a transverse wave, the oscillations are                     to the direction of travel of the wave.
Definition
 Perpendicular
Term
 Longitudinal wave examples include....
Definition
 Sound waves P-waves
Term
 In a longitudinal wave, the oscillations are                         in the same direction as the wave is travelling.
Definition
 Backwards and forwards
Term
 Amplitude?
Definition
 Maximum displacement from equilibrium position.
Term
 Wavelength?
Definition
 Distance from a point on a wave to the same point on the next wave cycle (crest to crest or trough to tough).
Term
 Frequency?
Definition
 Number of oscillations per second.
Term
 Period?
Definition
 Time for one wave cycle.
Term
 Wave speed equation?
Definition
 Wave speed = frequency x wavelength
Term
 Frequency equation?
Definition
 Frequency = 1/period
Term
 What is the medium?
Definition
 The substance the wave is travelling through.
Term
 Angle of reflection = ?
Definition
 Angle of reflection = Angle of incidence
Term
 In a mirror, the virtual image is the same           behind the mirror, as the object is in            of the mirror.
Definition
 In a mirror, the virtual image is the same DISTANCE behind the mirror, as the object is in FRONT of the mirror.
Term
 Refraction?
Definition
 When a wave crosses a boundary at an angle, if the speed changes the direction of travel changes.
Term
 Waves increase in speed or slow down in shallow water??
Definition
 Waves slow down in shallower water.
Term
 Light travels slower in......
Definition
 Light travels slower in..... glass perspex water   than it does in air.
Term
 In refraction, if the wave slows down, it bends               the normal.
Definition
 towards
Term
 In air, and in a vacuum, light travels at what speed?
Definition
 3 x 108 m/s   (300,000,000 m/s)
Term
 Diffraction?
Definition
 Waves spreading out through a gap or round a barrier.
Term
 Diffraction is most obvious when waves pass through a gap of about one wavelength.
Definition
Term
 wavelengths are diffracted more than          wavelengths.
Definition
 Long wavelengths are diffracted more than short wavelengths.
Term
 For sound, higher frequency = higher or lower pitch?
Definition
 For sound, higher frequency = higher pitch
Term
 For sound, bigger amplitude = Louder or quieter sound?
Definition
 For sound, bigger amplitude = Louder sound
Term
 Human hearing range?
Definition
 20 Hz to 20kHz
Term
 Sound above 20 kHz?
Definition
 Ultrasound
Term
 Light travels in          lines.
Definition
 Light travels in straight lines.
Term
 A ray is a line to show the direction of part of a light wave.
Definition
Term
 A real image can be seen on a screen.
Definition
Term
 A virtual image cannot be seen on a screen.
Definition
Term
 Total internal reflection happens when................
Definition
 Total internal reflection happens when the angle of incidence is bigger than the critical angle (for that boundary).
Term
 Total internal reflection happens when travelling from a                          medium.
Definition
 Total internal reflection happens when travelling from a slower to a faster medium.
Term
 Light/infra red signals travel along an optical fibre by repeated total internal reflection.
Definition
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