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Questions and Answers
What gives rise to an electromagnetic wave?
What gives rise to an electromagnetic wave?
- Time varying electric field only
- Static electric field
- Time varying magnetic field only
- Mutually perpendicular time varying electric and magnetic fields (correct)
Which of the following has the highest frequency?
Which of the following has the highest frequency?
- Ultra-Violet rays
- Infrared radiation
- Gamma rays (correct)
- X-rays
What is a characteristic of electromagnetic waves?
What is a characteristic of electromagnetic waves?
- They are longitudinal in nature
- They require a material medium for propagation
- They are transverse in nature (correct)
- They propagate at a speed lower than light
Which application of X-rays involves detecting explosives and gold?
Which application of X-rays involves detecting explosives and gold?
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How do infrared rays from the sun contribute to sustaining life on earth?
How do infrared rays from the sun contribute to sustaining life on earth?
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Which type of rays are used in surgery for detecting fractures and diseased organs?
Which type of rays are used in surgery for detecting fractures and diseased organs?
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Study Notes
Electromagnetic Waves
- Electromagnetic Waves (EM Waves): Generated by accelerating charges and oscillating electric and magnetic fields
- Frequency: Determines the type of EM wave. Higher frequency means more energy.
Electromagnetic Spectrum
- Gamma rays: Highest frequency, most energetic, used in medical imaging and sterilization
- X-rays: High frequency, used in medical imaging (radiology), security screening, and material analysis
- Ultraviolet (UV) rays: Cause sunburn and skin cancer, used in sterilization and tanning beds
- Visible light: The portion of EM spectrum that humans can see
- Infrared (IR) rays: Used in thermal imaging, night vision, and heat transfer, also how we feel heat from the sun
- Microwaves: Used in cooking, telecommunications, and radar
- Radio waves: Used in broadcasting, communication, and navigation
Applications of EM Waves
- X-ray Security Screening: Utilizes X-ray technology to detect explosives and dense materials like gold
- Infrared Radiation from Sun: Provides warmth to Earth, essential for plant photosynthesis and supporting life
- X-ray Imaging: Medical application utilizing X-rays to create images of bones and internal organs, helping to diagnose fractures and diseases.
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