Which statement describes how echolocation and ultrasound imaging are the same? a. they both use the absorption of sound waves. b. they both use the diffraction of sound waves. c. they both use the reflection of sound waves. d. they both use the transmission of sound waves.

The correct option is C.

Explanation:

The sound wave is reflected back after striking from the barrier. This is called the reflection of the sound.

When the sound wave incidents on the barrier then it is called incident wave.

When the sound wave gets reflected back from the barrier then it is called reflected wave.

Ultrasound imaging is a medical technique which is used to take the image of the internal parts of organ of the body.

Echolocation is the process which is used by several species. It is used by bats to locate its prey. It is the biological SONAR.

Therefore, echolocation and ultrasound imaging are same as they both use the reflection of sound waves.

need to see circuit to get time constant

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.