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EJU Science: Physics - Waves and Electricity Flashcards

6 cards from real EJU practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 EJU Science: Physics - Waves and Electricity flashcards as text

  1. What is the relationship between wave frequency (f), wavelength (λ), and wave speed (v)?

    Answer: v = fλ

    The wave equation v = fλ states that wave speed equals frequency multiplied by wavelength.

  2. In the EJU physics context, what phenomenon occurs when two waves overlap and their displacements add together?

    Answer: Superposition

    The principle of superposition states that when two waves meet, the resulting displacement is the sum of the individual displacements.

  3. A sound wave has a frequency of 500 Hz and travels at 340 m/s in air. What is its wavelength?

    Answer: 0.68 m

    Using v = fλ, λ = v/f = 340/500 = 0.68 m.

  4. What type of wave is sound?

    Answer: Longitudinal wave

    Sound is a longitudinal wave because the particles in the medium vibrate parallel to the direction of wave propagation.

  5. Which of the following correctly describes the Doppler effect?

    Answer: The observed frequency of a wave changes when the source or observer is moving

    The Doppler effect is the change in observed frequency due to relative motion between the wave source and the observer.

  6. What is the unit of frequency in the SI system?

    Answer: Hertz (Hz)

    Frequency is measured in Hertz (Hz), where 1 Hz equals one cycle per second.