For which questions could a scientist develop a testable hypothesis? check all that apply.
which planet is the prettiest?
how long is a day on neptune?
what is the composition of jupiter's atmosphere?
do planets prefer being closer to or farther from the sun?
which planet has the most moons?

How long is a day on Neptune

What is the composition of Jupiter's atmosphere

Which planet has the most moons?

Explanation:

Sentence option one is not a testable hypothesis because the answer would be an opinion. Sentence option 4 can not be tested because planets do not, and can not have opinions.

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.