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Questions and Answers
Which scientist is recognized as the father of electromagnetic theory?
Which scientist is recognized as the father of electromagnetic theory?
What happens to the frequency of electromagnetic waves as the wavelength increases?
What happens to the frequency of electromagnetic waves as the wavelength increases?
Which of the following regions of the electromagnetic spectrum is known to be harmful?
Which of the following regions of the electromagnetic spectrum is known to be harmful?
What is the role of electric and magnetic fields in electromagnetic waves?
What is the role of electric and magnetic fields in electromagnetic waves?
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What is the unit of speed commonly used for electromagnetic waves?
What is the unit of speed commonly used for electromagnetic waves?
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Which of the following applications is NOT associated with radio waves?
Which of the following applications is NOT associated with radio waves?
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What is the frequency range of microwaves?
What is the frequency range of microwaves?
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Who discovered infrared waves?
Who discovered infrared waves?
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The visible light spectrum includes which of the following colors?
The visible light spectrum includes which of the following colors?
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Which range of wavelength corresponds to radio waves?
Which range of wavelength corresponds to radio waves?
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Which application utilizes infrared waves?
Which application utilizes infrared waves?
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In which frequency range do Very High radio waves operate?
In which frequency range do Very High radio waves operate?
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What is the primary application of frequency-modulated (FM) radio broadcasting?
What is the primary application of frequency-modulated (FM) radio broadcasting?
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What is the primary application of X-rays?
What is the primary application of X-rays?
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Which type of ultraviolet radiation is almost completely absorbed by the atmosphere?
Which type of ultraviolet radiation is almost completely absorbed by the atmosphere?
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Who discovered gamma rays?
Who discovered gamma rays?
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What is a characteristic of hard X-rays compared to soft X-rays?
What is a characteristic of hard X-rays compared to soft X-rays?
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Which of the following applications is NOT associated with gamma rays?
Which of the following applications is NOT associated with gamma rays?
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What is one of the main sources of ultraviolet radiation?
What is one of the main sources of ultraviolet radiation?
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What does the acronym LASER stand for?
What does the acronym LASER stand for?
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In which application is visible light communication (VLC) NOT typically used?
In which application is visible light communication (VLC) NOT typically used?
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What is the formula for calculating frequency from wave speed and wavelength?
What is the formula for calculating frequency from wave speed and wavelength?
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What is the unit of Planck's constant?
What is the unit of Planck's constant?
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Which type of radiation includes X-rays and gamma radiation?
Which type of radiation includes X-rays and gamma radiation?
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What is a potential immediate effect of high-level ionizing radiation exposure?
What is a potential immediate effect of high-level ionizing radiation exposure?
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Which of the following forms of radiation is considered non-ionizing?
Which of the following forms of radiation is considered non-ionizing?
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What is the calculated frequency of red visible light with a wavelength of $6.5 imes 10^{-7}$ m?
What is the calculated frequency of red visible light with a wavelength of $6.5 imes 10^{-7}$ m?
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What can overexposure to infrared waves cause?
What can overexposure to infrared waves cause?
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What is the relationship between the energy of electromagnetic radiation and its frequency?
What is the relationship between the energy of electromagnetic radiation and its frequency?
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What effect does the enhanced greenhouse effect lead to?
What effect does the enhanced greenhouse effect lead to?
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Which type of electromagnetic radiation can significantly interfere with medical devices like pacemakers?
Which type of electromagnetic radiation can significantly interfere with medical devices like pacemakers?
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Study Notes
Electromagnetic Waves
- EM waves are classified according to their wavelength
- Visible light—only waves that can be seen with our naked eye
- Not all of the EM waves are purely beneficial to us, some are harmful
- EM waves interact with the molecules
Harmful Waves
- UV rays
- X-rays
- Gamma rays
Crest
- Highest point of the wave
Amplitude
- Height of the wave
Wavelength
- The distance between the crests (the distance from one wave to another)
- Measured in meters
Electric Field
- Is produced by charged particles
- Also produced by changing magnetic field
Magnetic Field
- Is generated by a moving charged particle
- Also produced by changing electric field
Electromagnetic Waves
- Are transverse waves
- Is produced by interplay of changing electric and magnetic fields
- Are a combination of electric and magnetic fields that oscillate perpendicular to each other and to the direction of the propagating wave
Scientists
- James Clerk Maxwell (1831-1879)
- Scottish physicist
- predictions and did not conduct further study
- Father of Electro-magnetic Theory
- Maxwell's equation - laws on electricity and magnetism
- Heinrich Hertz - discovered the EM waves
- Isaac Newton - discovered visible light
Electromagnetic Waves
- EM waves travel through vacuum at a speed of 3 x 10^8 m/s
- The speed, frequency, and wavelength are related by the equation v = fλ
- v is the speed of the wave (unit: m/s)
- f is the frequency (in Hz)
- λ is the wavelength (unit: m/s)
Electromagnetic Spectrum
- is the continuous range of electromagnetic waves arranged in order of frequency or wavelength
- Divided into regions based in a certain frequency or wavelength interval
- There is no sharp dividing point between one type of wave and the next
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Description
Explore the essential concepts of electromagnetic (EM) waves, including their classifications, properties, and interactions with matter. Understand the significance of harmful EM waves like UV rays, X-rays, and gamma rays. This quiz covers definitions of key terms such as amplitude, wavelength, and the roles of electric and magnetic fields.
