Astudent is trying to determine if a solution is acidic or basic. she does not have any litmus paper. which would she most likely use to get a reading on her solution? vinegar soap cabbage juice aquarium water

cabbage juice  

Explanation:

Red cabbage has pH indicator pigment. It changes color when mixed with acid or basic solution.

For acidic solution, the juice turns red. For neutral, it shows purple color. For basic solution have pH 8-9 : Blue for 10-11: green and strong basic solutions are indicated when cabbage juice turns yellow in color.

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.

365.25 earth days are in the year of a light year