Flashcards
reflection,refraction and sound
Cards in this deck (21)
- 1what happens when waves reach a boundary between one medium (material) and anotherthey can be reflected,refracted, absorbed or transmitted
- 2what can ray diagrams be used forto show what happens
- 3what are the step you must take when constructing a ray diagram-rays must be drawn with a ruler
-each straight section of ray should have a single arrow drawn on it to indicate the direction of movement
-where the ray meets the boundary a 'normal' should be drawn at right angles to the boundary
-all relevant angles should be labelled - 4when waves are reflected at a surface what two things are equalwhen waves are reflected at a surface the angle of incidence is equal to the angle of reflection
- 5when a wave passes from one media to another it can be refracted and change direction. what does the direction of refraction depend on- the angle at which the wave hits the boundary
-the materials involved - 6what is refractive indexfor light rays, the way in which a material effects refraction is called its refractive index
- 7what happens when light travels-from a material with z low refractive index to one with a higher refractive index it bends towards the normal
-for a material with a high refractive index to one with a lower refractive index it bends away from the normal - 8what is refraction due torefraction is due to the difference in the wave speed in the different media
- 9when a light wave enters at an angle a medium in which it travels slower..what happens-the first part of the light wave to enter the medium slows down
-the rest of the wave continues at the higher speed
-this causes the wave to change direction towards the normal - 10RP)write a sample method for investigating reflection and refraction1-set up the equipment as shown
2-draw around the semi-circular block
3-mark the position of the light ray at the start, at the end and where is exits and enters the block
4-remove the block and connect the marks to show the light rays
5-add normal lines and measure the angles of incidence and refraction
6- repeat on anew piece of paper for a range of incident angles
7-repeat the experiment with blocks made of different transparent materials - 11what do sound waves have-frequency
-amplitude
-wavelength - 12what does the amplitude of a sound wave relate tothe loudness
- 13what does the frequency and wavelength of a sound wave relate tothe pitch-the higher the frequency, the higher the pitch
- 14what is the normal range of human hearingfrom 20Hz to 20kHz (20000Hz)
- 15what can sound travel throughliquids and solids as well as air
- 16what causes soundsound, in any medium is due to vibration of the particles that make up the medium
- 17in a solid, what can these oscillations causethe entire object to vibrate with the same frequency as the sound wave
- 18what does the conversion of a sound wave to a vibration only occur overthe conversion of sound waves to vibrations only occurs over a limited range of frequencies. The range of frequencies converted is dependant on the structure f the object
- 19what do sound waves do to eardrumsthey cause the eardrum and other structures to vibrate and it is the vibration that is heard as sound
- 20what limits human hearingthe limited range of conversion
- 21give examples of sound waves being converted to vibration-in the ear drum, by a microphone or a glass being shattered by a opera singer
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- GCSE physics new Flashcards on reflection,refraction and sound, created by ella stokes on 05/11/2017.
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- ella stokes
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