Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
271–280 of 356
Question 271
4 marks · Normal
Answer and see the solution →The electromagnetic spectrum includes waves with a wide range of wavelengths and frequencies.
(a)[1 mark]State the relationship between wavelength and frequency for electromagnetic waves.
(b)[2 marks]Arrange the following electromagnetic waves in order of increasing wavelength: infrared, gamma rays, microwaves, visible light.
(c)[1 mark]Why do gamma rays have a higher frequency than microwaves? Explain in terms of energy.
Question 272
5 marks · Normal
Answer and see the solution →A communication satellite receives signals using microwaves and sends back information using infrared waves.
(a)[1 mark]State the order of infrared and microwaves in the electromagnetic spectrum in terms of wavelength, starting with the longest.
(b)[2 marks]Explain why microwaves are suitable for transmitting signals to and from the satellite compared to visible light.
(c)[2 marks]Give one possible health effect of excessive exposure to microwaves and state a precaution to reduce the risk.
Question 273
4 marks · Normal
Answer and see the solution →A teacher shines visible red light (wavelength m) and uses a microwave oven that emits microwaves of wavelength m.
(a)[2 marks]Calculate the frequency of the red light. Take the speed of light in a vacuum as m/s.
(b)[2 marks]Calculate the frequency of the microwave.
Question 274
4 marks · Normal
Answer and see the solution →A hospital uses both X-rays and infrared cameras for patient care.
(a)[1 mark]State the main property that all electromagnetic waves have in common.
(b)[2 marks]Describe one use of infrared in hospitals, and one use of X-rays.
(c)[1 mark]Explain why X-rays require more safety precautions than infrared when used with patients.
Question 275
1 mark · Easy
Answer and see the solution →What is the name given to objects that reflect light but do not produce their own light?
Question 276
1 mark · Easy
Answer and check →What is the angle between the incident ray and the normal called?
- A.angle of incidence
- B.angle of refraction
- C.angle of deviation
- D.angle of reflection
Question 277
1 mark · Easy
Answer and see the solution →State the law of reflection.
Question 278
3 marks · Easy
Answer and see the solution →A ray of light strikes a flat mirror as shown in the diagram below.
Ray of light striking a mirror (a)[1 mark]On the diagram, draw the normal at the point B where the ray meets the mirror.
(b)[1 mark]Label the angle of incidence on your diagram.
(c)[1 mark]Sketch the reflected ray and label it.
Question 279
3 marks · Easy
Answer and see the solution →The diagram below shows a ray of light entering a rectangular glass block from air.
Ray of light entering glass block (a)[1 mark]Draw the normal at point F where the ray meets the glass block.
(b)[1 mark]Show the path of the refracted ray inside the glass block.
(c)[1 mark]Label the angle of incidence and the angle of refraction on your diagram.
Question 280
1 mark · Easy
Answer and see the solution →What term describes the change in direction of light as it passes from one medium to another?