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Sound

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선생님을 위해: Sound(KS3 Science, Physics)을(를) 위한 바로 쓸 수 있는 수업 슬라이드, 복습 노트, 다이어그램 — 수업에 사용하거나, 학생들이 실시간 게임으로 즐기는 인터랙티브 클래스 활동으로 진행하세요.

수업 노트

What is Sound?

  • Sound is produced by a vibrating object.
  • The vibration transfers energy by making air particles collide.
  • Sound is a longitudinal wave: vibrations are parallel to the direction of wave travel.

Compressions and Rarefactions

  • Compressions are regions where air particles are close together.
  • Rarefactions are regions where air particles are further apart.
  • The wavelength is the distance between two consecutive compressions (or two rarefactions).

Frequency and Pitch

  • Frequency is the number of waves passing a point per second, measured in Hertz (Hz).
  • The higher the frequency, the higher the pitch.
  • Human auditory range: 20 Hz to 20,000 Hz.
  • Sound above 20,000 Hz is called ultrasound.

Amplitude and Volume

  • Amplitude is the maximum displacement of particles from their rest position.
  • The larger the amplitude, the louder the sound.

Detecting Sound

  • A microphone converts sound waves into electrical signals.
  • The electrical signal can be displayed on an oscilloscope.
  • The human ear works similarly: sound vibrates the eardrum, which sends electrical signals to the brain.

Diagram showing reflection of a sound wave (not to scale; sound reflects similarly to light).

Reflectionnormalincident40°reflected40°

슬라이드

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연습 문제

무료 미리 보기 — 55개 중 8개 문제. 가입하면 전부 볼 수 있어요.

  1. 1.What causes a sound wave?

    Easy
    • AA vibrating object
    • BA stationary object
    • CLight energy
    • DHeat energy

  2. 2.Which type of wave is a sound wave?

    Easy
    • ALongitudinal
    • BTransverse
    • CElectromagnetic
    • DStationary

  3. 3.What is the frequency of a sound wave measured in?

    Easy
    • AHertz (Hz)
    • BDecibels (dB)
    • CMetres (m)
    • DSeconds (s)

  4. 4.The human auditory range is 20 Hz to 20 000 Hz. How many waves pass a point every second for a sound wave with a frequency of 20 000 Hz?

    Easy
    • A20 000
    • B20
    • C200
    • D2 000

  5. 5.Which statement about compressions and rarefactions is correct?

    Easy
    • AA compression is where air particles are close together; a rarefaction is where they are further apart.
    • BA compression is where air particles are further apart; a rarefaction is where they are close together.
    • CA compression and rarefaction are the same.
    • DA compression is a region of low pressure; a rarefaction is a region of high pressure.

  6. 6.Which of the following statements is true?

    Easy
    • AA microphone turns a sound wave into an electrical signal.
    • BA microphone turns an electrical signal into a sound wave.
    • CA microphone amplifies a sound wave.
    • DA microphone increases the frequency of a sound wave.

  7. 7.The wavelength of a sound wave is the distance between:

    Easy
    • AOne compression and the next compression
    • BA compression and a rarefaction
    • CThe source and the observer
    • DThe highest and lowest point of the wave

  8. 8.A sound wave has a frequency of 440 Hz. How many complete waves pass a point in 0.5 seconds?

    Medium
    • A220
    • B440
    • C880
    • D110

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