Which type of waves can be used to clear a blockage from small tubes in the kidneys? sound waves and visible light x-rays and radio waves radio waves and sound waves visible light and x-rays

Sound waves and visible light will be your answer. Hope I helped!

Explanation : The blockage in the small tubes in the kidneys it is denoted as urinary tract obstruction. This blockage inhibits the flow of urine through its normal path.

Sound waves and visible light  are the waves used to clear a blockage from small tubes in the kidneys. The procedure through which the blockage is removed is called Shock Wave Lithotripsy (SWL).

car a and b are moving in opposite directions

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speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.