Physical Science chapter 4

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Anonymous
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81994
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Physical Science chapter 4
Updated:
2011-04-26 16:46:57
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dr biblo
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science
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  1. __ of an electric current through a wire occurs as an electron travels a short distance and then repels another electron.
    conduction
  2. __ rays are high energy rays which can cause skin cancer
    ultraviolet
  3. is a measurement of the rate of current flow
    amp
  4. light usually travels more rapidly through a __ than a solid or liquid
    gas
  5. when the temperature is high, the resistance to the flow of electricity would probably be __
    high
  6. __ is associated with Mr. Roy G. Biv
    light
  7. __ wavelengths of light have a higher frequency
    shorter
  8. __ rays are heat rays, they have a frequency slightly lower than visible light
    infra-red
  9. an __ is uncharged, but it contains electrons and protons, which are charged particles
    atom
  10. ultrasonic waves occur at frequencies __ than our ears can hear
    higher
  11. two negative charges will __ each other
    repel
  12. __ effect involves a decrease in the frequency of sound or light as the source moves away from us.
    doppler
  13. sound usually travels more rapidly through a __ than a liquid and gas
    solid
  14. a __ circuit has only one path for the electric current to follow
    series
  15. the path through which an electrical current flows
    circuit
  16. a __ is a unit used to measure the potential difference between two points in a circuit
    volt
  17. __ electricity flows from one place to another in a circuit
    current
  18. the distance between successive disturbances of the same types (from one wave crest to another)
    wavelength
  19. __ from the sun travels fastest through space ( a vacuum)
    radiation
  20. the parts of a magnet where magnetic force (field) is the strongest (north and south)
    poles
  21. the number of disturbances of the same type (compressions, crests, troughs, ect..) that pass a point in a second
    frequency
  22. the part of a sound wave where the molecules are closer together
    compression
  23. a unit used to indicate the loudness of a sound
    decibels
  24. electricity travels through a wire more easily when the wire is __
    cold
  25. an electromagnet can be made by wrapping a wire around a(n) __ core
    iron
  26. an electron has a __ charge
    negative
  27. a device which can be used to decrease voltage and increase current, or to increase voltage and decrease current
    transformer
  28. the unit used as a measure of the amount of current
    ampere
  29. a substance which does not permit the passage of electricity
    insulator
  30. __ electrical charges repel each other
    like
  31. an increase in __ causes an increase in the speed of a sound wave.
    temperature
  32. a form of energy which can be produced by an electric current moving along a thin filament of wire
    light
  33. when two different objects are rubbed together; __ electricity may result
    static
  34. a transparent device which refracts or bends light rays as they pass through it
    lens
  35. the __ coil is the coil of wire in a transformer that electricity from an outside source is flowing through.
    primary
  36. light is a type of __ radiation
    electromagnetic
  37. a __ wire connected to the round post of a plug allows electrical charges to move through a low resistance pathway into the ground (protecting us)
    ground
  38. accumulated electrical charges that are at rest (not moving) are __ electricity
    static
  39. traveling faster than the speed of sound
    supersonic
  40. a substance that electricity will flow through is a __
    conductor
  41. light is bounced back or __ from the surface of mirror
    reflected
  42. __ electrical charges attract each other
    unlike
  43. a __ has a silver coated surface so that it reflects (or bounces back) light rays
    mirror
  44. visible __ occurs at the frequencies which stimulate receptors in our eyes allowing us to see
    light
  45. __s are determined by dividing the voltage by the resistance (ohms)
    amp

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