Answer:
Physical layer never need the header/footer.
Explanation:
The physical layer performs the data transfer in bits through the cables. Various Interface cards like Bluetooth, RS-485, GSM, wireless options, etc., are part of the Physical layer. And in other words, the Physical layer ensures the mechanical or electrical interface between the two devices concerned. The data is being transferred in the form of electrical signals, and this implies that the Physical layer never requires a header or footer for its processing. Though, the application, internet, and transport layer all need headers/footers, as they carry important information required by them for the processing at their level.
Answer:
Variables which are declared within a function are called Local variables.They are named local because they are used locally only means they cannot be used outside the function in which they are declared.These local variables exist in the memory till the function execution starts and are deleted when the execution of function ends.Hence they lose their value between calls to the function in which they are declared.
Answer:
Embedded Computer
<u>Definition</u>
The Computer that are used to perform a specific task are called Embedded Computers. It also contains memory, processors and peripheral devices that are required to perform a dedicated task in a large system.
<u>Explanation</u>:
Thermostat is device that is used to measure and control the temperature of specific device. Temperature control is single task that should be performed by a small computer, This is the only task that is assigned to computer to perform.
This is the reason, We choose a computer that performs only single task. Therefore we choose Embedded Computers.
<em><u>Types of Embedded Computer </u></em>
1. Aurduino
2. Raspberry pi
3. Gizmo
etc.
Answer:
Radiation and enjoyment
Explanation:
In the most basic form, a cell phone is essentially a two-way radio, consisting of a radio transmitter and a radio receiver. When you chat with your friend on your cell phone, your phone converts your voice into an electrical signal, which is then transmitted via radio waves to the nearest cell tower.
Stress and anxiety. Excessive use of mobile phones is bad for your psychological health. Constant over-use of mobile phones leads to increased anxiety, feelings of loneliness, and low self-esteem. Reliance on mobile phones can also cause irritation, frustration, and impatience when they cannot be used.
Even when you can't talk, cell phones make communication easy with the use of text messaging. With more sophisticated cell phones, you can also send pictures, video clips, listen to music, and even access the Internet. Some cell phones also provide access to calculators, maps, GPS devices and television.