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 : _____