Do You Know
Questions & Answers on General Knowledge.
What everyday household chemicals (cleaners, paints, detergents, etc.) contain large enough amounts of phosphor to glow under black light?
Fluorescent paints and many laundry detergents contain fluorescent chemicals-chemicals that absorb ultraviolet light and use its energy to produce visible light. Fluorescent paints are designed to do exactly that, so they certainly contain enough "phosphor" for that purpose. Detergents have fluorescent dyes or "brighteners" added because it helps to make fabrics appear whiter. Aging fabric appears yellowish because it absorbs some blue light. To replace the missing blue light, the brighteners absorb invisible ultraviolet and use its energy to emit blue light.
What's the difference between fluorescent, phosphorescent, and triboluminescent?
How did the Second World War end?
How does a halogen lamp get so hot?
How do fletchings stabilize an arrow in flight after it is shot from a bow?
Why do I see "No Smoking" signs in the windows of restaurants?
Why do little kids ride tricycles instead of bikes?
Why do some frogs and almost all toads secrete poison?
How did the Mughals keep the Empire together?
Is water, at say 35° F, more dense than water at 80° F?
Why do we call a large timepiece a “clock”?
Please explain pectin and why sugar and acid are needed when making jelly.
Where does our food come from?
What is an electron and what keeps its mass and charge together so that when the mass moves, the charge moves with it?
How do elephants use their trunks?
How is an egg fertilized?
How does a dehumidifier work?
What makes a goose a goose?
How does the distance between the transmitting antenna and the receiving antenna affect the amount of current flowing between the two systems?
How does electricity travel through wires?
How is chlorine gas used to disinfect water at treatment plants?
How many different kinds of animals are there?
How do insects grow?
How do you get static out of hair?
Which is the largest of all apes?
How was mail delivered before there were mail carriers?
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