🤔 How it works …….. ⁉
How the Telephone Works.☎️📞
When a person speaks into a telephone, the sound waves created by his voice enter the mouthpiece. An electric current carries the sound to the telephone of the person he is talking to.
When a person talks into the telephone, the sound waves strike the diaphragm and make it vibrate.
When two telephones are connected, analog voice data is transmitted over the copper wires of the PSTN (Public Switched Telephone Network).
The voice data is then converted into electrical signals which are eventually routed in the switching centers. Finally, a connection is made and communication is possible.
The number dialled on a landline is routed via the telephone wire to the Electric cross connect system at the local telephone exchange.
This system has a direct mapping for the number dialled to the location of the called person. It simply switches the call to subsequent cross connects till the destination is reached.
Something that converts energy from one form to another is called a transducer. The loudspeaker in a phone works in the opposite way: it takes an incoming electrical current and uses magnetism to convert the electrical energy back into sound energy you can hear.
😳Why❓❓❓
Why Don’t We Remember Being Babies?
Virtually nobody has memories from very early childhood because at that age, our brains don’t yet function in a way that bundles information into the complex neural patterns that we know as memories.
This is called “semantic memory
Until sometime between the ages two and four, try you however, children lack “episodic memory” — memory regarding the details of a specific event. Such memories are stored in several parts of the brain’s surface, or “cortex.” For example, memory of sound is processed in the auditory cortexes, on the sides of the brain, while visual memory is managed by the visual cortex, at the back.
A region of the brain called the hippocampus ties all the scattered pieces together. The hippocampus, tucked very neatly in the middle of our brain, is responsible for pulling those all together and tying them.
At the age of seven, children could still recall more than 60% of the recorded events, but children who were just a year older remembered only about 40 %
The reason we don’t remember being babies is because infants and toddlers don’t have a fully developed memory. But babies as young as six months can form both short-term memories that last for minutes, and long-term memories that last weeks.
💁🏻♂️ GK TODAY
Alexander Graham Bell , best known for his invention of the telephone , revolutionized communication as we know it. His interest in sound technology was deep-rooted and personal, as both his wife and mother were deaf.
Did you know?
Sweet Lime or Mosambi juice helps enhance Immunity. Vitamin C and other antioxidants present in sweet lime or its juice can help strengthen immunity.
It helps stay away from colds and flu. Stimulate blood circulation and thus strengthens the immune system.
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Ch. Naveen Kumar |
