Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

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565. Why do we lose our sense of taste when we have a cold?

Our sense of smell is responsible for about 80%of what we taste. The tastebuds present on our tongues are limited to only the basic sensations: sweet, salty, sour and bitter. All other flavors that we experience come from smell. This is why, when our nose is blocked, as by cold, most foods seem bland or tasteless. Our sense of smell can normally detect up to 10,000 smells.
 
564. Why we hear humming sound when standing below high tension powerline?

Transformers are a different story, but with just high-voltage (generally >350kV) wires the standard explanation is corona discharge.
In the air occasionally some gas molecules will become ionized. This means that the molecule gains or loses and electron. This can happen through chemical reactions, but it's generally more likely that UV light knock an electron off. An electrical field doesn't really affect uncharged molecules, but it does affect ions. The positively charged ions are relatively heavy, so move slowly, but the free electrons are very light so they get pushed away very quickly. These fast moving electrons bump other molecules and can knock more electrons free. In addition to moving ions, this can cause a slight glow (when an electron recombines with a positive ion), and heats the air which causes noise.
A negatively charged wire will attract positively charged ions, are push away the free electrons (or any negative charged ions), while a positively charged wire will do the opposite. In a power line carrying AC current, the charge on the wire alternates between positive and negative (with some time in between where it isn't enough charge to matter). The result is that the air gets briefly heated 120 times per second, which makes a hum.
If the wire is smaller, then the electric field near the wire is stronger, so one of the reasons high voltage wires are as large as they are is to reduce this effect.
 
563. What is the definition of the Berlin Wall? Why did the Berlin wall Fall?

Berlin wall , A wall that separated West Berlin, Germany, from East Germany, which surrounded it until 1989. At the end of World War II, the victorious Allies divided Berlin, the German capital, into four sectors. The eastern, or Russian, sector became the capital of communist East Germany.
The Fall of the Wall. On November 9, 1989, as the Cold War began to thaw across Eastern Europe, the spokesman for East Berlin's Communist Party announced a change in his city's relations with the West. Starting at midnight that day, he said, citizens of the GDR were free to cross the country's borders.
 
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