Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
301–310 of 356
Question 301
3 marks · Normal
Answer and see the solution →Describe an experiment using a semi-circular glass block and a ray box to determine the critical angle of glass. State the steps you would take and the measurements you would make.
Question 302
1 mark · Normal
Answer and check →Which statement correctly describes total internal reflection in the context of light travelling from glass into air?
- A.It occurs when the angle of incidence is less than the critical angle.
- B.It occurs only when the angle of reflection equals the critical angle.
- C.It occurs when the angle of incidence is greater than the critical angle.
- D.It occurs for any angle when light passes from air into glass.
Question 303
3 marks · Normal
Answer and see the solution →A glass block has a refractive index of 1.48. Calculate: a) The value of sin of the critical angle. b) The value of the critical angle itself (to 2 decimal places).
Question 304
3 marks · Normal
Answer and see the solution →A laser beam is sent into an optical fibre made of glass surrounded by air. Explain why the light remains trapped inside the fibre when it travels around bends.
Question 305
4 marks · Normal
Answer and see the solution →A beam of light travels from water (refractive index 1.33) into air.
(a)[3 marks]Calculate the critical angle for the water–air boundary. Give your answer to 1 decimal place.
(b)[1 mark]Would total internal reflection occur if the angle of incidence in water is 48°? Show your working.
Question 306
1 mark · Easy
Answer and see the solution →Name the two types of glass that make up an optical fibre.
Question 307
1 mark · Easy
Answer and check →What property must the core of an optical fibre have compared to the cladding to allow total internal reflection?
- A.The core must have a higher refractive index than the cladding.
- B.The core must have a lower refractive index than the cladding.
- C.Both core and cladding must have the same refractive index.
- D.The cladding must be made of plastic.
Question 308
2 marks · Easy
Answer and see the solution →Explain why light is able to travel through a curved optical fibre without escaping.
Question 309
2 marks · Easy
Answer and see the solution →The diagram below represents a section through an optical fibre.
Optical fibre cross-section (a)[2 marks]Label A and B on the diagram as 'core' or 'cladding'.
Question 310
3 marks · Easy
Answer and see the solution →An engineer uses optical fibres to inspect the inside of a jet engine.
(a)[2 marks]State two reasons why using an optical fibre is useful in this situation.
(b)[1 mark]Explain how light travels from the entrance to the exit of the fibre.