Flashcards
Physics- P1.5
Flashcards do conjunto (24)
- 1What do all waves do?Move energy from one place to another
- 2Def of oscillationvibration
- 3Def of a transverse wave? example?the oscillation (vibration) is at a right angle to the direction to the energy transfer
light - 4Def of a longitudinal wave? e.g.?the oscillation(vibration) is at a parallel to the direction of the energy transfer
sound - 5def of wavelength?the difference from a point on one wave to the corresponding point on the next wave
- 6def of amplitude?the maximum displacement of a wave from it's middle position
- 7def of frequency?the number of waves produced each second
- 8what does v stand for? what's it measured in? f? λ?wave speed measured in metres per second (m/s)
frequency measured in hertz (Hz)
wavelength measured in metres (m) - 9What does the pitch of a note depend on?the frequency of the sound wave
(low frequency=low pitch etc.) - 10What is an echo?a reflected sound wave
- 11What is reflection?The change in the direction of a wave when it hits a surface
- 12What is the normal? What is the angle of incidence (i)? What is the angle of reflection (r)?a line of 90 degrees to a surface
the angle between the incident ray and the normal ray
the angle between a reflected ray and the normal - 13When light is reflected at a surface, what rule do the light rays obey?angle of incidence= angle of reflection
- 14What is a virtual image? What 3 things is an image in a plane mirror always?when the light reflected in the mirror
seems to come from behind the mirror
virtual
upright
laterally inverted (turned sideways) - 15What is refraction?the change in direction of a wave as it passes across the boundary from one medium to another
- 16The ray of light entering the block and the ray of light leaving the block are...parallell
- 17What is diffraction?the spreading out of a wave as it passes through the gap in a barrier or moves past an obsticle
- 18Are short wavelength waves or long wavelength waves diffracted?long
- 19What is the doppler effect in relation to sound?The source of the sound of constant frequency moves away from you , the frequency of sound you hear decreases - the waves seem to stretch
- 20What is red shift?If a light source moved away from you quickly enough, the light waves you see would have a longer wavelength and decreased frequency- this would make the light look as if it had moved towards the red end of the spectrum
- 21What do scientists believe about the universe? what is this theory called?What do scientists believe about the universe?
what is this theory called?that the universe began with a huge explosion. at that moment all the matter in the universe, concentrated at a tiny point in space, started to expand outwards
The big bang theory - 22What does it show when scientists look at the light from distant galaxies? What does this show?red-shift- galaxies must be moving away from the earth at great speed
- 23scientists have observed the further away a galaxy is from earth... What does this suggest?the bigger the red-shift-galaxies further away must be moving more quickly
- 24What provides evidence to support the big bang theory?Red shift
Informações
- Descrição
- biology Physics P1 FlashCards sobre Physics- P1.5, criado por sophie.west2012. em 07-03-2015.
- Criado por
- sophie.west2012.
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