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  •   How emergency calls are connected without network coverage?#9599

    They don’t work with satellites. They work the same way as your normal calls do.

    When you are out of network coverage, it does not mean that there are no network towers nearby. It just means that your particular network’s tower is unreachable. So this is why you can’t make normal calls. By law and design all towers should be able to handle emergency calls from any phones no matter what network SIM card they use.

    And bands are always shared within networks under mobile infrastructure sharing. For example, Vodafone would have a contract or deal with Idea and other networks like Aircel to share their bands in areas where Vodafone lack towers. So even when a subscriber is outside the coverage area of his network, the cellphone will keep pinging all the nearest stations. It just won’t show it on the display. And when you make an emergency call, any nearby tower with the strongest signal will be used.

    But if you are in the middle of nowhere like the Sahara desert where there are no communication towers, you are in bad luck. You can’t make emergency calls.

  •   Could a black hole serve as a wormhole?#5689

    Does black holes violate the second law of thermodynamics?

    No it does not! Black holes has the most entropy in the universe.

    Where does all that entropy go?

    Most of the entropy lost by the materials that fall inside a black hole is rescued back to the universe by Hawking’s radiation. Hawking (with Bekenstein) also proved that the surface area of the event horizon is proportional to the mass of the black hole, thus proving that the entropy is preserved in the universe.

  •   Could a black hole serve as a wormhole?#5673

    In order to traverse through a wormhole, you would need a traversable wormhole in the first place. Such wormholes are so quick in theory that you need to be so fast to travel through it. Such wormholes are only possible if exotic matters exist in our universe. Beyond this point, a basic explanation is tough, as everything else simply solves GR and is apparently theories.

  •   Neural Adaptation vs Habituation – What are the differences?#5454

    The example for neural adaptation says,

    When you are exposed to a particular odour/stimuli for a very long time, (your own odour, the smell of your house and similar continuous stimuli), the receptors would hinder themselves to it and eventually ‘adapt’ to it

    And for habituation,

    A good example of this is our ears tuning out some of the frequently heard noise at our home.

    I still don’t understand. Both are constant stimuli and how one differ from the other?

  •   What is the speed of smell?#5453

    Sound is the collision of all particles in the air. Smell is caused by the chemicals in the air. So smell is a wave too. But its speed is dependent on different variables. Different scent chemicals traverse at different rates through air. Mostly depends on Mean Free Path of the molecules in action.

  •   Why most wind turbines have three blades while one is the most efficient design?#5452

    Adding to Karthik’s answer, aesthetic value is another reason why companies prefer three bladed turbines over two. It just looks good that way.

  •   Dawn's better look at the bright spots on Ceres#4397

    And we are close today. Dawn spacecraft has taken us this photograph from an orbit of 1470 kilometers.

    A mountain on Ceres, located in the southern hemisphere. Stands about 6 kilometers high.

  •   Dawn's better look at the bright spots on Ceres#4309

    Update: A new investigation suggests that the bright spots are locally sublimating materials into the atmosphere engulfing the Occator crater. So the ice volcano theory is probably true guys. This gets interesting.

  •   What is the speed of smell?#5463

    Even if you use Graham’s law, you will still be ending up with an approximate answer only. The system is too complex in an open environment.

  •   Dawn's better look at the bright spots on Ceres#4400

    Does that look like a ‘DOT’ to you? It is not mapped yet. It takes 11 days to map the whole planet and I read that it will do it multiple times. Maybe NASA will receive an ultra clear image of the white spots in a few days.

Viewing 10 replies - 1 through 10 (of 10 total)