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Waves, Sound, and Light Flashcards

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

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  1. What is the approximate speed of light in a vacuum?

    Answer: 3 × 10⁸ m/s

    The speed of light in a vacuum is approximately 3 × 10⁸ meters per second (about 300,000 km/s).

  2. What type of wave is sound?

    Answer: Longitudinal wave

    Sound is a longitudinal wave because the particles of the medium vibrate parallel to the direction of wave travel, creating compressions and rarefactions.

  3. What is the relationship between frequency and wavelength for a wave traveling at constant speed?

    Answer: They are inversely proportional

    Since wave speed = frequency × wavelength, at constant speed, frequency and wavelength are inversely proportional — as one increases, the other decreases.

  4. When a light ray bounces off a surface at the same angle it hit, what phenomenon is occurring?

    Answer: Reflection

    Reflection occurs when a wave bounces off a surface, following the law that the angle of incidence equals the angle of reflection.

  5. What is the unit of frequency?

    Answer: Hertz (Hz)

    Frequency is measured in Hertz (Hz), which represents the number of complete wave cycles per second.

  6. If the frequency of a sound wave increases, what happens to the pitch heard by a listener?

    Answer: Pitch increases

    Higher frequency sound waves produce higher pitched sounds because more vibrations per second correspond to a higher musical tone.

  7. What is the bending of light as it passes from one medium into another medium called?

    Answer: Refraction

    Refraction is the bending of light when it passes from one medium to another due to a change in wave speed at the boundary.