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Flashcards

P1

Peter Bills-Brown Inglês 33 flashcards

Flashcards do conjunto (33)

  1. 1What happens when an objects heat is increased?The more infrared radiation it radiates at a given time
  2. 2what are the features of dark, matt surfaces?The are good absorbers and good emitters of infrared radiation
  3. 3What are the features of light and shiny surfaces?They are poor absorbers and emitters of infrared radiation. They reflect infrared radiation well.
  4. 4What are the different states of matter?Solid, liquid and gas
  5. 5What changes when matter changes from one state to another?The amount of energy it has changes
  6. 6What is conduction?Is the movement of thermal energy through a material without the particles in the material moving
  7. 7What is convection?Convection happens in fluids (liquids & gases). The heat energy moves through the material as the particles in the material move through the material
  8. 8What is condensation?Condensation is the change of state from a gas to a liquid, it is caused by cooling. For example water vapour in warm air condenses into a liquid when cooled
  9. 9What are the factors that affect transfers of energy by heating?If the surface area or volume, the material of the object and the surface the object is in contact with
  10. 10What happens the bigger the temperature difference between an object and its surroundings?The faster the rate at which energy is transferred by heating
  11. 11What are U-values?A U-value is how effective a material is as a insulator
  12. 12What happens the lower the U-value?The lower the U-value the better an insulator it is
  13. 13What is the specific heat capacity of a substance?It is the amount of energy required to change the temperature of one kilogram of it by one degree celsius.
  14. 14This is the formula for specific heat capacity what do the letters stand for? E=MxCxOE- The energy transferred in joules M-The mass in kilograms C-the specific heat capacity O- The temperature change in degrees Celsius
  15. 15What is the formula for energy transferred from the mains?E=PxT where E=energy transferred in kilowatt-hours/joules P= power in kilowatts/watts T= time in hours/seconds
  16. 16What are the effects of using different energy resources?The release of substances into the atmosphere. The production of waste materials. Noise and visual pollution. The destruction of wildlife habitats
  17. 17What happens when you increase the voltage?It reduces the current required and reduces the energy loses in the cables
  18. 18What do waves do?waves transfer energy
  19. 19What are the two different ways in which waves travel?transverse or longitudinal
  20. 20What time of wave is an electromagnetic wave?Transverse
  21. 21what time of wave is a sound wave?Longitudinal
  22. 22What do longitudinal waves show?Areas of compression's and rarefraction
  23. 23What can be done with waves?They can be refracted, reflected or diffracted
  24. 24What is an interface?The point at which two densities meet
  25. 25What happens when waves are refracted at an interface?They undergo a change in direction
  26. 26What do all waves obey?V=Fx(upside down y) where V= speed in meters per second F= Frequency in hertz (upside down Y)=wavelength in meters
  27. 27What is the normal?A construction line perpendicular to the reflecting surface at a point of incidence
  28. 28What is the angle of incidence equal to?The angle of reflection
  29. 29What is the pitch of a sound determined by?The frequency and loudness by its amplitude
  30. 30What is the Doppler effect?If a wave source is moving relative to an observer there will be a change in the observed wavelength and frequency.
  31. 31What is red shift?There is an observed increase in the wavelength of light from most distant galaxies. The further away the galaxies are, the faster they are moving, and the bigger the observed increase in wavelength.
  32. 32What is Cosmic Microwave Background Radiation (CMBR)?It is a form of electromagnetic radiation filling the universe that comes from radiation that was present shortly after the beginning of the universe
  33. 33What is the only theory that can explain the existence of CMBR?The big bang theory

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FlashCards sobre P1, criado por Peter Bills-Brown em 04-11-2013.
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