Question

Give reason :we use power resources from dawn to dusk

Answer 1

Wind energy: is a pollution free, inexhaustible source of energy. In this, the kinetic energy of wind is converted into electrical energy through turbines.

Wind mills have been used for grinding grain and lifting water since the ancient times.

Wind farms with clusters of such wind mills are located in coastal region and mountain where strong and steady winds blow.

Netherland, Germany, Denmark, USA and Spain are noted for their wind energy production. The wind power plant at Lamba in Gujarat is the largest in Asia. Tamil meets a sizable share of its energy needs from wind farms.

Geothermal energy: heat energy obtained from the earth is called geothermal energy. The hot water that gushes out through natural geysers or geothermal springs is used to produce thermal energy.

Geothermal energy has been used for cooking, heating, washing and bathing for several year in

USA and Central America.

In India, geothermal plants are located in Noni Karan in Himarhal, Pradosh and Puga valley in Ladakh.

Answer 2

Interesting question. I think the answer is that to good approximation they're the same, or rather one is the time - reversed version of the other. They certainly feel different, but it's hard to tease out anything that's clearly not related to the psychological difference of going from light to dark or vice versa. If you think of the globe lying half in shadow and half in sunlight, with a narrow band of fuzzy twilight separating them, the duration of dawn or dusk has to do with the angle at which you pass through this band (related to latitude and season) but not whether you're going forwards or backwards. I believe this is the reason for the rapid sundown in the tropics.

It's certainly likely that in some places there are geographic differences between east and west (mountains, oceans, etc.) that have significant effects. And it's probably true that there are general mechanisms whereby daybreak and sunset could be different. For instance, the air above the ground is hotter on the lit side of the boundary zone, and light will bend away from hotter air, as in a mirage. So that could cause a slight asymmetry between going into and coming from the lit area. (I think that particular effect would make dusk a little bit shorter.) But I'd guess that these sorts of effects are rather subtle.