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If the moment of inertia of two objects is equal and the ratio of their angular velocities is 3:1, then the ratio of rotational kinetic energy is: ()

A. 9:1
B. 3:1
C. 1:3
D. 1:9

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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

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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

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The sound wave is ().

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

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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

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If the moment of inertia of two objects is equal and the ratio of their angular velocities is 3:1, then the ratio of rotational kinetic energy is: ()

A. 9:1 B. 3:1 C. 1:3 D. 1:9

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

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 ().

A. 9:1
B. 3:1
C. 1:3
D. 1:9