Flashcards
Physics
Flashcards do conjunto (25)
- 1Infrared RadiationElectromagnetic waves between visible light and microwaves in the electromagnetic spectrum
- 2Electromagnetic SpectrumRadio waves
Micro waves
Infrared
Visible
Ultra violet
X-ray
Gamma ray - 3Radio waves- Gamma rayLong wavelength- Short wavelength
Low frequency- Short frequency
Low energy- High energy - 4v = λ x fSpeed (m/s) =Wavelength (m) x Frequency (Hz)
- 5E = m x c x θEnergy transferred (J) = mass (kg) x specific heat capacity (J/kg°C) x temperature change (°C)
- 6E = p x tEnergy transferred (J) / (kJ) = power (W) x time (S)
- 7National GridSystem of cables and transformers
- 8Transverse waveWave in which the vibrations are perpendicular to the direction of energy transfer
- 9Longitudinal waveWave in which the vibrations are parallel to the direction of energy transfer
- 10—Transverse wave
- 11—Longitudinal wave
- 12DiffractionThe spreading of waves when they pass through a gap or around the edges of an obstacle which has a similar size as the wavelength of the waves
- 13RefractionThe change of direction of a light ray when it passes across a boundary between two transparent substances (including air)
- 14Virtual imageCannot be formed on a screen
- 15Real imageCan be formed on a screen/ rays of light pass through the point where the image is formed
- 16Doppler effectThe apparent change in frequency of a wave due to the motion of the source
- 17Red shiftThe decrease in frequency/increase in wavelength because the source is moving away from the observer
- 18Blue shiftThe increase in frequency/ decrease in wavelength because the source is moving towards the observer
- 19How does the red shift support the big bang theory?All distant galaxies show the red shift and the furthest galaxies have the biggest red shift. All distant galaxies are movies away from us and the furthest are moving faster. Our universe is expanding. Initially it must have started as a small point.
- 20—
- 21Big bang theoryUniverse expanding from a very small point
- 22The steady state theoryThe universe, although expanding, has always existed without a beginning in time
- 23Where does CMBR come from?All parts of the universe
- 24What do scientists believe is the origin of CMBR?Radiation produced shortly after Big Bang
- 25Edward HubbleAn astronomer who observed that the light from galaxies that are moving away from the Earth showed a red-shift (wavelength of light appears to increase)
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- FlashCards sobre Physics, criado por georgiarice em 10-06-2015.
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- georgiarice
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