Match the term with its description. Acid A) A value from 0 to 14 that is used to specify how acidic or basic a compound is when it is dissolved in water

Base B) Used to measure the pH of substances by determining their hydrogen ion concentration

pH C) A compound that increases hydroxide ions (OH−) when it is dissolved in a solution

Litmus paper D) A compound that increases hydrogen ions (H+) when it is dissolved in a solution

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.

prndulum needs thread, weight clock to time swings