Com 2400 Exam 1 Study Guide With Complete Questions And Correct Detailed Answers.

sender/receiver, medium, contextual factor, message, feedback // source, encoding, channel, message, decoding, and receiver - correct answer Describe the five elements in the communication process. Sound Vibrations / Shared Meaning - correct answer What is required if the unique sounds our vocal cords produce have to be understood by the listener? not long / as soon as the vibrations die - correct answer How long do spoken words exist? Speech is Transent unless recorded and written is permanent - correct answer What is the difference between speech and written communication in terms of their performance? 60,000 years in Africa - correct answer When and where did speech of oral communication emerge among humans? 5,000 years in Iraq - correct answer When and Where did written communication emerge? The mean of how we communicate with other people through telephones, mobile phones, television, etc. - correct answer Definition of Telecommunication Through messengers who would travel to another land to deliver a message - correct answer How did our ancestors conduct telecommunication up until 200 years ago? how fast and the travel aspect to it since some were on horses to travel while other's walked or ran. - correct answer Why is it said that telecommunication in those days was inextricably tied to transportation systems? pigeons/smoke/running and walking - correct answer Long distance communication methods that did not depend on transportation systems in ancient times? w/ a certain pattern of smoke in a code, the receivers will understand the message - correct answer Why is it said that smoke signals are a form of broadcasting? Certain movements or angles of the body/arms with flags - correct answer How was a semaphore flag system used to send messages to other cities? transmitting electrical signals over wires - correct answer How does a telegraph work? 50 baud - 66 words per minute - correct answer What is the speed of telegraph messages? Morse code / a signal of communication by muscular movement - correct answer What is meant by dots and dashes? Samuel Morse - correct answer In the US, who developed the code used in telegraph communication? Someone who uses a telegraph to send and recieve the Morse code to communicate by land lines/radio - correct answer Who is telegraph operator? What is his job? direct current, wire cable length, current indicating device, some kind of light source - correct answer Necessary elements for telegraph infrastructure? Yes, it depends on location to work well - correct answer Is it true that every telecommunication system or transportation system requires an infrastructure? Hastened the speed at which news was disseminated - correct answer How did the telegraph affect the newsgathering business? combination of business models, including digital advertising, subscriptions, affiliate linking, and ecommerce sales - correct answer How do news agencies make money? What is their source of revenue? Reulers (UK), AP (US), AFP (France) - correct answer Name three of the oldest news agencies? Western Union Telegraphy - correct answer Which company built the first national telegraph network? Western Union - correct answer Which company had a near-monopoly over land line telegraph in the US? A cable laid on the sea bed between land - based stations to carry telecommunication signals across stretches of ocean and sea. First one was laid in 1850 between England and France - correct answer What is a submarine cable? Where was the first submarine cable installed? What was it called? US - Progress on the project took off in the mid-1850s, when U.S. entrepreneur Cyrus W. Field began investing heavily in telegraphy - correct answer Which nation invested heavily in the submarine cable telegraph? Why? German physicist and experimentalist who demonstrated that the electromagnetic waved predicted by Maxwell actually existed. - correct answer Who is Heinrich Hertz, and what was his contribution to science? Electric and magnetic fields travel through space as waves moving at the speed of light // Publication of "A Dynamical Theory of Electromagnetic Field" - correct answer What was James Clerk Maxwell's contribution to the science of electromagnetic waves? Guglielmo Marconi - Italian physicist and inventor of a successful wireless telegraph. He got interested in Hertz and his invisible waves generated by electromagnetic interactions and that helped send signals to location a mile away. - correct answer Who was Marconi, and how did he use his knowledge of electromagnetic waves to develop a wireless communication system? Radio waves: are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Electromagnetic waves or EM waves: are waves that are created as a result of vibrations between an electric field and a magnetic field. - correct answer What is the difference between radio waves and electromagnetic waves? He came to England and was able to get broadcasting to get up to 12 miles and applied for his first patents. That way the British and the post office could broadcast things much further. - correct answer Why were the British enthusiastic about Marconi's invention? He used radio waves in a wireless receiver as a way to detect and send the messages. - correct answer Explain how Marconi sent messages between two points not connected by a wire? Marconi monopolized the wireless business with his non-interconnection policy. Marconi's non-interconnection policy means: 1) Wireless operators employed by Marconi would not receive from or transmit to wireless equipment manufactured by other companies. 2) Marconi's wireless network was not permitted to interconnect with AT&T's telephone network or Western Union's telegraph network. 3) Marconi's British wireless network was not interconnected to the subsidiary developed by the American subsidiary. - correct answer How did Marconi monopolize the wireless business with his non-interconnection policy? What is the non-interconnection policy? The Marconi Wireless Telegraph Company of America - correct answer What was the name of the subsidiary Marconi established in the US? Telegraph and telephone: Telegraph transmits messages in Morse code whereas telephone transmits human voice converted into electric energy. - correct answer What is an advantage of wireless compared to landline telegraph? -Difficult to set up -outsiders could access network -Significantly slower - correct answer What were the disadvantages of wireless compared to the landline telegraph? Anyone could see what was being sent if they could access it. In wars, the enemy could some how get the message in their hands and use it to their advantage. - correct answer Explain why the lack of privacy is considered a disadvantage of wireless? How was this drawback addressed during wars? 1)Sarnoff and RCA had made a major investment in AM broadcasting. 2)Sarnoff and Armstrong were archrivals fighting each other in the courts over patent rights. 3)RCA had developed a similar technology on their own. - correct answer Why did Sarnoff reject Armstrong's invention and break off their friendship? Lee de Forest - Triode Audion Phonofilm - correct answer What was the first amplifier of wireless signals? Who was the inventor? Invented the regenerative circuit—the first reliable means of amplifying radio waves. He improved amplification by inventing the superheterodyne circuit in 1918 and the superregenerative circuit in 1920. - correct answer What was Howard Armstrong's contribution to the amplification of wireless signals? Yankee Network - correct answer What is the name of the FM network developed by Armstrong? television - correct answer What was the new invention that Sarnoff presented to the world during the World Fair of 1939? The message spoken with be transformed into waves and in doing so will travel to the person on other end and come out as a normal message. - correct answer What happens when we speak into the mouthpiece of a telephone compared to when we talk directly to a person in front of us? modern radio, television, and radar. - correct answer What were the three critical inventions of Howard Armstrong?