Notes with worthy tutorials
Based on the direction of data from sender to receiver, there can be 3 types of transmission modes which are as follows
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.
Despite of the many advantages and features of E-commerce, there are some disadvantages of E-commerce. These disadvantages are minor and most of them will be no more with time and updates in technology. However, following are some of the disadvantages of E-commerce.
A network must meet a certain number of criteria to become useable in real world situation. Most important of these criteria are the 3 criteria as follows.
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
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
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.
2A → Productinitial concentration : a molL-1 → 0final concentration (t=t) : (a-x) molL-1 → x … Read more
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
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