题目内容

The effect of ultrasound on biological tissue does not include which of the following. ()

A. cavitation effect
B. ionization effect
C. mechanical effect
D. heat effect

查看答案

搜索结果不匹配？点我反馈

更多问题

When a train leaves the station at a speed of 66m/s and whistles at a frequency of 1800Hz, set the sound velocity in the air is 330m/s and the sound frequency you will hear at the station will be ().

A. 2200 Hz
B. 1500Hz
C. 2400 Hz
D. 1000 Hz

查看答案

The sound wave is ().

A. Mechanical transverse wave
B. Mechanical longitudinal wave
C. Electromagnetic wave
D. X rays.

查看答案

The intensity of wave is ().

A. energy of wave through unit area
B. energy of wave through unit area vertically
C. average energy per unit time through a section
D. average energy per unit time through per unit area vertically

查看答案

The difference between two sound intensity level is 10dB, then the ratio of the two sound intensity is ().

A. 10
B. 20
C. 100
D. 2

查看答案

The effect of ultrasound on biological tissue does not include which of the following. ()

A. cavitation effect B. ionization effect C. mechanical effect D. heat effect

When a train leaves the station at a speed of 66m/s and whistles at a frequency of 1800Hz, set the sound velocity in the air is 330m/s and the sound frequency you will hear at the station will be ().

The sound wave is ().

The intensity of wave is ().

The difference between two sound intensity level is 10dB, then the ratio of the two sound intensity is ().

A. cavitation effect
B. ionization effect
C. mechanical effect
D. heat effect