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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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When the contact angle is equal to 20 degrees, it represents liquid can () solid

A. wet
B. not wet
C. completely wet
D. not at all wet

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Which of the following is responsible for the fact that the increase in magnification of a microscope does not enable us to see more clearly in detail? ()

A. the linear propagation of light
B. the refraction of light
C. the reflection of light
D. the diffraction of light

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The necessary conditions for producing x-rays are : ()

A. high voltage power supply and low voltage power supply
B. high voltage power supply and X-ray tube
C. high voltage power supply and suitable target material
D. high speed electrons beam and proper target

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What factor determines the shortest wavelength in a continuous X - ray spectrum? ( )

A. the current in the tube
B. the target material
C. the size of the target
D. the voltage of the tube

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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

When the contact angle is equal to 20 degrees, it represents liquid can () solid

Which of the following is responsible for the fact that the increase in magnification of a microscope does not enable us to see more clearly in detail? ()

The necessary conditions for producing x-rays are : ()

What factor determines the shortest wavelength in a continuous X - ray spectrum? ( )

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