Why does the redshift seen in the spectral lines from other galaxies support the big bang theory? o a. it is proof that energy and matter are quantized. o b. it is evidence that the universe is expanding. o c. it indicates that there is a lot of helium in the universe. o d. it shows that lengths contract as velocities near the speed of light.

answer:

hye

explanation:

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i. like it i'm gonna edit it tomorrow

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.