What is an optical fibre - Study guides, Class notes & Summaries

aqa a level physics paper 1 2023 What is meant by work function (2) - CORRECT ANSWER-Minimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - CORRECT ANSWER-Minimum energy required to remove an electron from an atom (1) from the ground state (1) Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) - CORRECT ANSWER-Energy of a photon is fixed/constant (1) Energy is required for electrons to o...

State what is meant by the term analogue signal (1 mark) A signal that can have any value State what is meant by the term digital signal (1 mark) A signal that has 2 values only which are 0 and 1. Explain 2 advantages of using digital signals instead of analogue signals to transmit television programmes. (2 marks) 1. Digital Signals can carry more info than Analogue signals. 2. Less interference so better quality is produced. Give 2 other differences between visible ligh...

State what is meant by the term analogue signal (1 mark) A signal that can have any value State what is meant by the term digital signal (1 mark) A signal that has 2 values only which are 0 and 1. Explain 2 advantages of using digital signals instead of analogue signals to transmit television programmes. (2 marks) 1. Digital Signals can carry more info than Analogue signals. 2. Less interference so better quality is produced. Give 2 other differences between visible li...

Topic 2: internet and communication technologies Terms in this set (240) Network two or more devices called nodes connected by some type of communications channel Node any device connected to a network server a node designed to act as a central network, a computer that provides various resources like network security; hardware, disk and printer access communications channel the connection between source and destination nodes(transmission medium) Switch Hardware that connects Node...

AQA A level Physics Questions and Answers Acceleration The rate of change of velocity Accurate result A result that is close to the true answer Apha decay A type of decay in which an unstable nucleus of an atom emits an alpha particle Alternating current A current that changes with time in a regular cycle Ammeter A component used to measure the current flowing through a circuit Amplitude The maximum displacement of a wave Angle of incidence The a...

What is meant by work function (2) - ANSWERSMinimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - ANSWERSMinimum energy required to remove an electron from an atom (1) from the ground state (1) Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) - ANSWERSEnergy of a photon is fixed/constant (1) Energy is required for electrons to overcome work function ø (1) Electrons deeper into/below th...

Biology exam paper questions - new Use the data about the length of leaves in the two sites to explain why standard deviation is more useful than range as a measure of variation within a population. ANS: Definition of range + SD / effect of outliers on range + SD; Ranges are similar in both areas; Suggests that variation within populations is similar; SD smaller in area of high light intensity; Shows that area of high light intensity is a more uniform population; describe the role of rib...

Refraction, Optic Fibres, Waves Review Questions with complete Solutions Graded A+ State and explain why the core of an optical fibre is made as narrow as possible. - Answers To reduce multipath dispersion To prevent data loss from the core which would cause attenuation. State one application of optical fibres and explain how this has benefited society. - Answers Endoscope - improved medical diagnosis Communications -improved transmission of data/high speed internet. what are the 3 parts of...

Test Bank Solution Manual for Optical Fibres & Refraction + Waves and Diffraction Explain how the glass cladding around the optical fibre's core improves the security of data being transmitted through it give a reason why this is important. - Answers *light does not enter the cladding so cannot pass across from one fibre to a neighbouring fibre* (1) fibres without cladding can allow light to pass between fibres when the surface of the fibre becomes scratched (1) personal data (...

Fibre Optics Principles Review Questions with complete Solutions Graded A+ when we talk about Fibre Optics, we are basically talking about the what? - Answers - transmission of radiant power through fibres made of transparent material such as glass, fused silica, or plastic OR - the transmission of data as light through a thin glass rod what are the benefits of optical fibres?(9) - Answers - high bandwidth - long distances - noise immunity (electromagnetic interference) - lightweight - c...