Data communication systems enable transfer of data using one of the three transmission modes. Data communication systems has 4 fundamental characteristics; which are delivery, accuracy, timeliness and jitter. Each of these 4 fundamental characteristics has it part in the effectiveness of a data communication system. However, data communication systems work through network systems and there are 3 necessary criteria for an effective and efficient network. Thus a data communication system also depend on the underlying network system’s effectiveness.
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5 Components of a Data Communication Network
Data Communication Network
Data communications are the exchange of data between two devices using one or multiple forms of transmission medium using one of the three transmission modes. That is, data communication is movement of data from one device or end-point to another device or end point through electrical or optical medium. Systems that facilitates this movement of data between devices or end-points are called data communication network. There are 5 components of a data communication network. The devices which are in need to be a part of a data communication network made up of computer hardware and software.
I encourage you study the book Data Communications and Networking with TCP IP Protocol Suite 6th Edition by Behrouz A Forouzan
Define molarity, molality, normality, mole-fraction.
Molarity (M): Molarity is defined as the number of moles of solute per litter of solution. That is, Here, W = weight of solute. M = molecular mass of solute V = volume of solution Molality (m): It is defined as the number of moles of solute per kg of solvent. … Read more
Show that the half-life of a second order reaction is inversely proportional to its initial concentration.
For the simple second order reaction 2A→product, we know the rate constant is given by, For half life, and Hence, as k is a constant, Thus, the half life of a second order reaction is inversely proportional to its initial concentration.
Derive an expression for the rate constant of 2nd reaction of the type, 2A→product.
2A → Productinitial concentration : a molL-1 → 0final concentration (t=t) : (a-x) molL-1 → x … Read more
Derive an expression for the rate constant of a first order reaction. Give its units.
Let us consider a first order reaction, A → product Suppose at the beginning of the reaction, that is, when t=0, the concentration of A is amolL and when t=t, the concentration of A is (a-x)molL. For a first order reaction, the rate of reaction, where k is the rate constant. integrating, Here, c is the … Read more
Define order and molecularity.
Order: Order of a reaction is defined by the number of atoms or molecules, whose concentration change during the reaction and determine the rate of the reaction. For example, It is a first order reaction. It is a second order reaction. Molecularity: The molecularity of an elementary reaction is defined as the number of reactant … Read more
12 Advantages of E-commerce
E-commerce
E-commerce or Electronic Commerce is a modern way of business. Transaction in case of buying or selling a product or service through electronic devices and internet connection is E-commerce. In E-commerce, the buyer and seller can not only communicate with each other but also the buyer can pay and the seller can receive payments through internet connection which can be called electronic payment service.
E-commerce has many features and must-have features and a few disadvantages also. However, here is a list of 12 Advantages of E-commerce.
What is E-commerce? 7 Features of E-commerce in Detail
E-commerce
E-commerce or Electronic Commerce is a modern way of business. Transaction in case of buying or selling a product or service through electronic devices and internet connection is E-commerce. In E-commerce, the buyer and seller can not only communicate with each other but also the buyer can pay and the seller can receive payments through internet connection which can be called electronic payment service. So in E-commerce, a product travels to buyer from seller or a service is served to it’s buyer without the need for the buyer to meet the seller by appearing physically. Again, in E-commerce, the seller receives payment for his/her sale without meeting the buyer physically.
How does a CRT monitor produces image on the screen?
Process of Producing Image on the Screen by a Color CRT Monitor: A CRT monitor has an electron guns at its back. The gun fires an electron beams at once through a magnetic coil that aims the beams to the screen. The screen is coated with a chemical called phosphors that glow when struck by … Read more