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Questions and Answers
What is the distance between two consecutive troughs or crests of a wave?
What is the unit of frequency?
What is the relationship between wavelength and frequency?
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?
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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?
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What is the nature of electromagnetic radiation?
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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?
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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.
