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Questions and Answers
What is the distance between two consecutive troughs or crests of a wave?
What is the distance between two consecutive troughs or crests of a wave?
What is the unit of frequency?
What is the unit of frequency?
What is the relationship between wavelength and frequency?
What is the relationship between wavelength and frequency?
What is the speed of light in meters per second?
What is the speed of light in meters per second?
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What happens to the frequency of a light wave if its wavelength is increased by a factor of 10?
What happens to the frequency of a light wave if its wavelength is increased by a factor of 10?
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What is the wavelength of a light wave with a frequency of 1.5 × 10^14 Hz?
What is the wavelength of a light wave with a frequency of 1.5 × 10^14 Hz?
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What is the product of wavelength and frequency?
What is the product of wavelength and frequency?
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What is the nature of electromagnetic radiation?
What is the nature of electromagnetic radiation?
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What is the symbol for wavelength?
What is the symbol for wavelength?
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What is the frequency of a light wave with a wavelength of 4.00 × 10^-7 m?
What is the frequency of a light wave with a wavelength of 4.00 × 10^-7 m?
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Study Notes
Electromagnetic Radiation
- Electromagnetic radiation is a form of energy that travels through space and includes heat, light, X-rays, and microwave energy.
- It exhibits wavelike properties, consisting of two waves oscillating perpendicular to each other: an oscillating magnetic field and an oscillating electric field.
Basic Properties of Waves
- A wave has a trough (lowest point) and a crest (highest point).
- Amplitude is the vertical distance between the tip of a crest and the wave's central axis, measuring the amount of energy transferred by a wave.
- Increasing the wavelength by a factor of 10 decreases the frequency to 1/10 of its initial value.
Period
- A wave's period is the length of time it takes for one wavelength to pass by a given point in space.
- The period (T) is the reciprocal of the wave's frequency (f): T = 1/f.
- The units of period are seconds (s).
Electromagnetic Spectrum
- The electromagnetic spectrum is the range of all types of electromagnetic radiation.
- The spectrum includes radio waves, microwaves, infrared light, ultraviolet light, X-rays, and gamma-rays.
- Radiation is energy that travels and spreads out as it goes, and examples include visible light from a lamp and radio waves from a radio station.
Types of Electromagnetic Radiation
- Radio waves: used for TV and mobile communication, can also be emitted by gases and stars in space.
- Microwaves: used for cooking, also used by astronomers to determine the structure of nearby galaxies and stars.
- Infrared: used in night vision goggles.
Wavelength and Frequency
- Wavelength is the horizontal distance between two consecutive troughs or crests.
- Frequency is the number of full wavelengths that pass by a given point in space every second, measured in Hertz (Hz).
- Wavelength and frequency are inversely proportional: shorter wavelength means higher frequency, and vice versa.
- The relationship between wavelength and frequency is given by the equation: λν = c, where c is the speed of light (3.00 × 10^8 m/s).
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Description
Test your understanding of electromagnetic waves, a fundamental concept in physics. This quiz covers the basics of electromagnetic radiation, its forms, and applications.
