What is an optical fibre - Study guides, Class notes & Summaries
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aqa a level physics paper 1 2023
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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...
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BTEC Applied Science - Physics Exam Questions and answers 2022/2023
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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...
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BTEC Applied Science - Physics Exam 2022/2023Questions And Answers 100% correct
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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...
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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 netw
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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...
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AQA A level Physics Questions and Answers
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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...
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Aqa a level physics paper 1 Study Guide
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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...
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Biology exam paper questions - new
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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...
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Refraction, Optic Fibres, Waves Review Questions with complete Solutions Graded A+
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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...
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Test Bank Solution Manual for Optical Fibres & Refraction + Waves and Diffraction
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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 (...
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Fibre Optics Principles Review Questions with complete Solutions Graded A+
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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...
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