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2.4 Nature of Waves

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  • Explain why sound waves cannot be polarised.
    Sound waves are longitudinal, meaning their oscillations are parallel to the wave direction, so they cannot be restricted to one plane.
  • Beth yw'r gwahaniaeth rhwng dadleoliad ac osgled?
    Dadleoliad yw pellter pwynt o’r safle ecwilibriwm; osgled yw'r dadleoliad mwyaf.
  • What does a progressive wave transfer?
    Energy without transferring matter.
  • Beth mae'n ei olygu pan fo dwy don mewn gwrthgyfnod?
    Mae ganddynt wahaniaeth cyfnod o 180° (neu π radian), sy'n golygu bod eu dadleoliadau bob amser yn groes i'w gilydd.
  • Beth mae'n ei olygu pan fydd dwy don mewn cyfnod?
    Mae ganddynt yr un amledd ac maent yn yr un pwynt yn eu cylchdro ar yr un pryd.
  • What is the difference between transverse and longitudinal waves?
    In transverse waves, oscillations are perpendicular to wave direction; in longitudinal waves, oscillations are parallel to wave direction.
  • What is the period of a wave?
    The time taken for one complete wave cycle.
  • Define the term polarisation.
    Polarisation restricts wave oscillations to a single plane.
  • What type of wave can be polarised?
    Transverse wave
  • What feature of a displacement–position graph allows you to determine the wavelength?
    The wavelength is the distance between two consecutive points in phase, such as two peaks or two troughs.
  • Describe how a displacement–time graph for a transverse wave differs from a displacement–position graph.
    A displacement–time graph shows how a point moves over time, while a displacement–position graph shows the wave’s shape at a single moment.
  • Beth yw uned SI ar gyfer toinfedd?
    Metr (m).
  • Beth yw uned amledd?
    Hertz (Hz).
  • Mae gan don ddŵr gyflymder o 2 m/e ac amledd o 4 Hz. Beth yw ei thonfedd?
    𝜆 = 𝑐/𝑓 = 2/4 = 0.5m
  • Mae gan don amledd o 500 Hz ac ystod ton o 0.6 m. Cyfrifwch ei chyflymder.
    𝑐 = 𝑓 𝜆 = 500 × 0.6 = 300 m/s
  • Nodwch yr hafaliad sy'n cysylltu cyflymder tonnau, amledd, a thonfedd
    𝑐 = 𝑓 𝜆
  • What type of wave is a sound wave?
    Longitudinal wave.
  • How is wave speed affected if the frequency of a wave is doubled but the wavelength remains constant?
    Wave speed doubles because 𝑐 = 𝑓 𝜆 c=fλ and 𝑓 f is doubled.
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