Sec 4 Combined Physics Electromagnetic spectrum Sample

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www.ApexEducators.com 1 Name : _________________________ Date: _________________________ Combined Sciences (Physics): Electromagnetic Spectrum 1. Electromagnetic Spectrum Lowest Frequency Highest Frequency radio waves microwave Infrared Visible light Ultraviolet (UV) X-ray Gamma ray Highest Wavelength Lowest Wavelength A) Properties of Electromagnetic Waves • All are transverse waves - Electric and magnetic fields oscillate at 90°. • Transfer energy from one place to another • Do not require any medium to travel from one place to another (can travel through vacuum). • Travel at speed of 3×10! m/s in vacuum. - Wave velocity is the product of frequency and wavelength (%='() - Frequency does not change when travelling from one medium to another. • Obey law of reflection and refraction

www.ApexEducators.com 2 B) Uses of Electromagnetic Waves Component Use Radio waves - Radio broadcasting - Navigation system - Telecommunications Microwave - Satellite TV - Microwave oven Infrared - Remote controllers - Infrared radiation sensors (security alarms) Visible light - Optical fibres UV - Sun bedding – Artificial tanning - Sterilisation devices X-ray - X-ray scanners for security - Medical X-ray imaging Gamma ray - Radiation therapy in cancer treatment C) Summary

www.ApexEducators.com 3 Name : _________________________ Date: _________________________ Electromagnetic Spectrum (Worksheet 1) Difficulty: Easy 1. The diagram below shows the components of the electromagnetic spectrum (a) Identify the components of the electromagnetic spectrum. Lowest Frequency Highest Frequency radio waves X-ray Highest Wavelength Lowest Wavelength (b) The electromagnetic waves are what type of wave? : ___________________ (c) Can electromagnetic waves travel in vacuum? Yes / No (d) What is the speed electromagnetic waves in vacuum? : _________________ m/s 2. Identify the use of each component of the electromagnetic spectrum. Component Use Radio waves X-ray

www.ApexEducators.com 4 Name : _________________________ Date: _________________________ Electromagnetic Spectrum (Worksheet 2) Paper 1 : MCQ 1. Which list of 3 electromagnetic waves is arranged in the correct order of decreasing wavelength? A. microwaves, infra-red radiation, visible light B. microwaves, ultraviolet radiation, infra-red radiation C. X-rays, ultra-violet radiation, gamma rays D. X-rays, ultra-violet radiation, microwaves 2. Which component in the electromagnetic spectrum is used to sterilise surgical equipment? A. gamma rays B. microwaves C. radio waves D. ultra-violet 3. A woman sits in the Sun. Which statement related the electromagnetic spectrum is not correct? A. she feels warm because of microwaves radiation from the surrounding B. she can hear the radio broadcast because of the radio waves transmitted from radio station C. she can see the sailboat in the sea because of the visible light from the Sun D. she gets a suntan because of the ultraviolet radiation from the Sun

www.ApexEducators.com 5 4. A type of electromagnetic radiation possesses the following properties. • harmful to the human body. • its frequency is higher than the frequency of ultra-violet radiation. • it is not detected by the human eye. What is this radiation? A. gamma rays B. microwaves C. light D. radio waves 5. How do the wavelength, frequency and speed of gamma radiation compare with that of ultraviolet radiation in a vacuum? wavelength frequency speed A B C D longer longer shorter shorter lower lower higher higher same lower lower same 6. Which row does not match the component of the electromagnetic spectrum with its use? component use A B C D microwaves visible light gamma-rays X-rays satellite transmission photography medical treatment radio communication 7. Which of the following electromagnetic waves is commonly used in satellite communications? A. infra-red waves B. microwaves C. radio waves D. x-rays

www.ApexEducators.com 6 8. The diagram below shows the electromagnetic spectrum of the electromagnetic waves in order. Which of the waves (A, B, C or D) is used for artificial sun tanning? 9. The figure shows the electromagnetic spectrum. Which part of the spectrum is found in region O? A. infra-red radiation B. radio waves C. visible light D. X-rays 10. Which is an application of microwaves A. Used in global positioning system (GPS) to communicate with satellites B. Used in scanning of luggage C. Used in treatment of cancer D. Used in TV-remote controllers 11. Radio waves, infrared waves and ultra-violet radiation are all part of the electromagnetic spectrum. What is the correct order of increasing wavelength?

www.ApexEducators.com 7 12. Which of the following is not an application of electromagnetic waves? A. Sonar system C. Infrared system for night navigation B. Radar system D. Wireless telecommunication system 13. Which of the following devices does not make use of electromagnetic waves in its operation? A. A camera C. Loudspeaker B. A radio set D. A television set 14. The diagram shows different regions of the electromagnetic spectrum. What regions do X and Y represent? X Y A. Ultraviolet Infrared B. Infrared X-ray C. X-ray Microwave D. Ultraviolet Microwave 15. Which of the following sets of electromagnetic waves have higher frequencies than the visible light? A. Radio waves, infrared radiation, ultraviolet radiation. B. Radio waves, microwaves, infrared radiation. C. X-ray, gamma rays, ultraviolet radiation. D. X-ray, microwaves, infrared radiation. 16. The table shows the electromagnetic spectrum of the electromagnetic waves. Which of the waves (A, B, C or D) is used in sunbeds and sterilizing of medical equipment?

www.ApexEducators.com 8 17. From the electromagnetic spectrum shown, compare the wavelength, frequency and speed of P and Q in vacuum. wavelength frequency speed A ("<(# '">'# %">%# B (">(# '"<'# %"<%# C ("<(# '">'# %"=%# D (">(# '"<'# %"=%# 18. Which of the following correctly lists three components of electromagnetic spectrum in order of decreasing frequency? A. gamma rays, visible light, microwaves B. gamma rays, microwaves, visible light C. microwaves, gamma rays, visible light D. microwaves, visible light, gamma rays

www.ApexEducators.com 9 Paper 2 : Structured Questions 1. A car passes through an average speed camera system as shown in Fig. 1.1. Fig 1.1 The average speed camera system makes use of some of the following electromagnetic waves: gamma rays infrared waves microwaves X-rays ultraviolet rays State (a) which wave is used to detect the vehicle at the entry and exit points of the enforcement zone, _____________________________________________________________________ (b) which wave is used to wirelessly transmit data between Camera 1 and Camera 2, ________________________________________________________________