____: n. the rate at which a sound wave, light wave, or radio wave moves up and down 震动频率
frequency
举一反三
- The sound wave is (). A: Mechanical transverse wave B: Mechanical longitudinal wave C: Electromagnetic wave D: X<br/>rays.
- What kind of wave does ultrasound belong to and has certain radiation? A: Electromagnetic wave B: Mechanical wave C: Particle wave D: Light wave
- In a ( ), the oscillations are perpendicular to the direction in which the wave travels. An example is a wave on a string. A: transverse wave B: longitudinal wave
- Seismic waves include P wave, S wave, Rayleigh wave and Love wave, of which the fastest is P wave.
- According to the different frequencies, the sound can be classified into ( ). A: audio sound B: ultrasonic wave C: infrasonic wave
内容
- 0
Light wave is a transverse wave.
- 1
Light wave is a transverse wave. A: 正确 B: 错误
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wave to/at sb wave goodbye to sb
- 3
驻波 standing wave；stationary wave
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A<br/>piezoelectric crystal is used to produce the ultrasound waves. What<br/>kind of ultrasound is produced? () A: Pressure<br/>wave ultrasound B: Electrical<br/>wave ultrasound C: Sound<br/>wave ultrasound D: Simple<br/>ultrasound