Optical fibres - Study guides, Class notes & Summaries

In an investigation into taxis, termites were split into 3 groups Group A had their eyes covered (moved straight up) Group B had their antenna covered (moved straight to light) Group C were the control (moved diagonally up and towards light) What does Group A show about the factors controlling termite movement? Antenna involved in response to gravity Don't respond to light as eyes are covered In a graph of membrane permeability against time, the line for Na+ ions increases rapidly betwee...

Define the amplitude of a wave - Correct answer-The distance from the rest position to the top of the wave Define the period of a wave - Correct answer-The time taken for one wavelength to pass a point Define the frequency of a wave - Correct answer-The number of waves per second How many ms are in 1s? - Correct answer-1000 Define coherent light - Correct answer-Coherent light has the same frequency/wavelength and is in phase Define a transverse wave - Correct answer-The oscillations are...

State what is meant by the term analogue signal (1 mark) - Correct answer-A signal that can have any value State what is meant by the term digital signal (1 mark) - Correct answer-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) - Correct answer-1. Digital Signals can carry more info than Analogue signals. 2. Less interference so better quality is produced. Give 2 othe...

BTEC Applied Science Unit 1 Chemistry Exam 271 Questions with Answers How many electrons can an s subshell hold? - CORRECT ANSWER 2 How many electrons can a p subshell hold? - CORRECT ANSWER 6 How many electrons can a d subshell hold? - CORRECT ANSWER 10 Which subshells are available in the first energy level? - CORRECT ANSWER s Which subshells are available in the second energy level? - CORRECT ANSWER s and p Which subshells are available in the third energy level? - CORRECT...

1. How many electrons can an s subshell hold? 2 2. How many electrons can a p subshell hold? 6 3. How many electrons can a d subshell hold? 10 4. Which subshells are available in the first energy level? 5. Which subshells are available in the second en- ergy level? 6. Which subshells are available in the third energy level? s s and p s, p and d 7. What is Hund's rule? (Think bus seats!) Every orbital in a sub- shell must be singly filled with an electron before any one orbital can be d...

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...

Amplitude - Correct answer-The maximum value of displacement in the oscillation cycle Displacement - Correct answer-How far the quantity has moved from its rest value at any given time Period - Correct answer-The time taken for one whole cycle of an oscillation Oscillation - Correct answer-A regularly repeating motion about a central value Wave speed equation - Correct answer-Wave speed = frequency x wavelength / v=fλ Transverse waves - Correct answer-The displacement of the wave is at ri...

Exam Bank Questions and Answers for Optical Fibre Transmission Characteristics Already Passed Optical Fibre - Answers Dielectric waveguide structure guiding light using core, cladding, and buffer. Refractive Index Profile - Answers Variation of refractive index across the core, cladding, and buffer of an optical fibre. Wavelengths - Answers Infrared wavelengths (820 nm, 1300 nm, 1550 nm) used in telecommunications via optical fibres. Preform - Answers Thick glass rod melted to form optical ...

Longitudinal wave - ANSWER-Particle vibration is parallel to direction of wave propagation Examples of a longitudinal wave - ANSWER-Sound waves, seismic p-waves Transverse wave - ANSWER-Particle vibration is perpendicular to direction of wave propagation Only transverse waves can be polarised Examples of a transverse wave - ANSWER-Electromagnetic radiation, seismic s-waves Particle displacement - ANSWER-The distance of a particle from its equilibrium position in given direction Amplitud...

AQA A LEVEL BIOLOGY Paper 1 2024 What is the function of the cell membrane? - ANS To control what enters and leaves the cell, acts as a barrier between the cell and its environment. What structural feature of the cell membrane allows substances to enter/leave? - ANS Partially permeable What is the fluid mosaic model? - ANS States that a membrane is a fluid structure (because phospholipids are constantly moving) with a "mosaic" of various proteins embedded in it Describe t...