Hurry up pl what do mri and ultrasound have in common as diagnostic imaging techniques? check all that apply.
low risk for tissue damage
uses radio waves
noninvasive
tomographic imaging
no radiation

1. low risk for tissue damage

2. Non invasive

3. No Radiation

Explanation:

MRI: Magnetic Resonance Imaging. In this diagnostic technique, powerful magnetic field and radio waves are used to make detailed pictures of body parts and tissues.

Ultrasound: In this technique sound waves of frequency more than 20000 Hz are used for imaging.

Both of these technique are non invasive, pose a very little threat to tissue damage and use no radiation. But differs in:

1. Use of radio waves: Only MRI technique uses radiation waves while Ultrasound uses sound waves.

2. Tomographic Imaging: Tomography imaging involves imaging by sectioning. But only MRI uses tomography imaging process.

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.