Science 8

Cards (129)

  • What is sound fundamentally based on?

    Vibrations
  • How can sound be visually represented?
    Using diagrams shaped like mountains and valleys
  • What are the two types of pitch in sound?
    High-pitched and low-pitched
  • What is necessary for sound to be generated by a loudspeaker?
    The loudspeaker must move up and down rapidly
  • What happens to air molecules when a loudspeaker generates sound?
    They are forced outwards and collide with others
  • What is the speed of sound in air?
    340 meters per second
  • How does the speed of sound in water compare to air?
    Sound travels faster in water
  • What type of wave is sound represented as in diagrams?
    Transverse wave
  • What does the frequency of a sound wave indicate?
    The number of pulses per second
  • What is the unit of frequency?
    Hertz
  • What is the human hearing range in Hertz?
    20 Hertz to 20,000 Hertz
  • What is described as subsonic sound?
    Sound below 20 Hertz
  • What is described as supersonic sound?
    Sound above 20,000 Hertz
  • What device represents sound as a wave?
    Oscilloscope
  • What happens to the wave shape when frequency increases?
    The wave shape changes and becomes narrower
  • What does a longer wavelength indicate about frequency?
    Fewer pulses and lower frequency
  • What does a shorter wavelength indicate about frequency?
    More pulses and higher frequency
  • What does the amplitude of a sound wave indicate?
    The loudness of the sound
  • What does a greater amplitude mean for sound?
    A louder sound
  • What does a lesser amplitude mean for sound?
    A softer sound
  • What would be beneficial if car and motorcycle exhausts could be used as fuel?
    Both vehicles would benefit from a cycle
  • What is the relationship between photosynthesis and cellular respiration?
    Their waste products are used by each other
  • What do living organisms need to eat to stay alive?
    Food
  • How do plants get their food?
    Through the process of photosynthesis
  • What three items do plants need for photosynthesis?
    Water, carbon dioxide, and sunlight
  • What are stomata?
    Small openings on plant surfaces
  • Where does photosynthesis occur in plants?
    In the chloroplasts
  • What do plants create during photosynthesis?
    Sugar in the form of glucose and oxygen
  • How can photosynthesis be defined?
    Process by which plants make food using sunlight
  • Why is cellular respiration important?
    It generates energy for daily activities
  • Where does cellular respiration take place?
    In the mitochondria
  • What does the mitochondria do?
    Acts as the power plant for cells
  • What are the products of cellular respiration?
    Carbon dioxide, water, and ATP
  • How do photosynthesis and cellular respiration relate to each other?
    They use each other's waste products
  • What is the cycle between photosynthesis and cellular respiration?
    • Photosynthesis uses carbon dioxide and water
    • Produces glucose and oxygen
    • Cellular respiration uses glucose and oxygen
    • Produces carbon dioxide, water, and ATP
    • Cycle repeats continuously
  • What is the chemical reaction in photosynthesis?
    Carbon dioxide plus water plus sunlight creates glucose
  • What is ATP?
    Energy produced during cellular respiration
  • What is the role of sunlight in photosynthesis?
    Provides energy for the chemical reaction
  • What do we breathe out that is used by plants?
    Carbon dioxide
  • How do plants contribute to the atmosphere?
    By releasing oxygen during photosynthesis