题目内容

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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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

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The direction of additional pressure at the curved liquid surface is ().

A. pointing into the liquid
B. pointing out of the liquid
C. along the surface of the liquid
D. pointing to the center of curvature

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The ratio of radius of two capillary tubes is 1:2 and both tubes are inserted into water. If water completely wets the wall of the tube, the ratio of the rising height of water in the two tubes is()

A. 1:2
B. 2:1
C. 1:1
D. 4:1

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The sound wave is ().

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

The intensity of wave is ().

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

The direction of additional pressure at the curved liquid surface is ().

The ratio of radius of two capillary tubes is 1:2 and both tubes are inserted into water. If water completely wets the wall of the tube, the ratio of the rising height of water in the two tubes is()

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