Friday, January 8, 2010
Here are 2 questions asked during physics lesson today:
Question one:
Why does the test tube disappear in the boiling tube when glycerin is poured in?
Answer:
This is because glycerin has the same refractive index as glass, so any light that passess through is bent equally. Since both glycerin and glass is transparent, its impossible for the eye to differciate the boundary by a change in the angle of refraction, therefore, the glass seems to disappear.
Question one:
Why does the test tube disappear in the boiling tube when glycerin is poured in?
Answer:
This is because glycerin has the same refractive index as glass, so any light that passess through is bent equally. Since both glycerin and glass is transparent, its impossible for the eye to differciate the boundary by a change in the angle of refraction, therefore, the glass seems to disappear.
Question Two:
Are sport drinks like 100 plus, gatorade, powerade acidic ?
Answer:
I searched the internet and couldn't find a direct answer to this question. If you do look at the ingriedients on the label, many sport drinks such as 100 plus, gatorade and other sport drinks, they contain citric acid and salts which are combinations of electrolytes such as sodium, potassium and chloride. An electrolyte is a substance which dissociates free ions when dissolved, to produce an electrically conductive medium. Because they generally consist of ions in solution, electrolytes are also known as ionic solutes. Electrolytes generally exist as acids, bases or salts. Therefore, sport drinks can be acidic.
source:
6:40 PM
