____: n. the rate at which a sound wave, light wave, or radio wave moves up and down 震动频率
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