Science & TechHow it works

Why your Wi-Fi crawls in the basement.

Wi-Fi mostly uses 2.4 GHz or 5 GHz. The lower frequency has longer waves, passes through walls better and reaches farther, but offers only three non-overlapping channels and shares the band with microwaves and Bluetooth. 5 GHz is faster and less crowded, yet walls and floors weaken it much more.

Useful: Put the router in a central, open spot, not in a cupboard; use 2.4 GHz for distant rooms.

Source: de.wikipedia.org

AlltagFunkTechnik

Difficulty:

Related cards

How an LED glows without getting hot.An incandescent bulb heats a tungsten wire to about 2,500 °C; only around 5 % of the energy becomes …
Why your phone ignores gloves but feels wet fingers.Modern displays are capacitive touchscreens: beneath the glass lies a grid of transparent …
How Bluetooth switches channels 1,600 times a second.Bluetooth uses the 2.4 GHz band, the same as Wi-Fi and microwave ovens. To avoid drowning, it …
How headphones erase noise by producing more sound.A microphone on the headphone measures outside noise. A chip calculates what part would reach your …
How your smoke detector sees smoke without having an eye.Inside sits a dark chamber with an LED and a photodiode set at an angle to each other. In clean air …
Why propellers look like bent bananas in phone photos.Your phone's sensor doesn't capture the image all at once but line by line from top to bottom. If …
The tin can existed 45 years before the can opener.In 1810 Peter Durand patented the tin can in England; Nicolas Appert had just developed preserving …
Every banana is slightly radioactive.Bananas are rich in potassium, and about 0.012 % of it is the radioactive isotope potassium-40. One …

Keep reading

This card belongs to the topic Science & Tech. Every card is short, cites a source and can be saved – due ones come back by themselves later.

About Doomlearn · Projects · Legal notice · Privacy · Terms