The development of quantum mechanics and the discovery that electromagnetic radiation can behave as as particle has allowed for the development of many new technologies. What is an example of a technology that was developed using knowledge of the particle model of light?
choose one
A. Electromagnets that use the relationship between electric and magnetic fields to produce magnetic fields?
B. Photodiodes in night vision goggles that use the photoelectric effect to produce an electric signal?
or C. Radio telescope that uses large curved dishes to focus radio waves that people know about creation of the stars?

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.