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EM Waves
Creator
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What are electromagnetic waves?
Waves that are created as a result of vibrations between an electric field and a magnetic field.
What are some practical applications of microwaves?
Microwave ovens, radar, telecommunications.
What are some practical applications of gamma rays?
Cancer treatment, sterilization of medical equipment and food.
What are some practical applications of ultraviolet (UV) radiation?
Sterilization, tanning beds, forensics.
What is refraction of EM waves?
The bending of waves as they pass from one medium to another.
What two fields oscillate perpendicular to each other and to the direction of wave propagation in an EM wave?
Electric field and magnetic field
What is the relationship between the frequency (f), wavelength (λ), and speed (c) of an EM wave?
c = fλ
What is diffraction of EM waves?
The bending of waves around obstacles or through openings.
What is a photon?
A quantum of electromagnetic radiation; a particle of light.
Which part of the EM spectrum can be used to see through fog or smoke?
Infrared radiation
What are the components of the electromagnetic spectrum?
Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays
Which end of the EM spectrum has the shortest wavelength and highest frequency?
Gamma rays
What are some practical applications of radio waves?
Radio communication, broadcasting, MRI.
What are some practical applications of visible light?
Sight, illumination, optical fibers, lasers.
Do EM waves require a medium to travel?
No, they can travel through a vacuum.
Are EM waves transverse or longitudinal?
Transverse waves
What is reflection of EM waves?
The bouncing back of waves when they strike a surface.
What is the nature of light?
Dual nature: it behaves as both a wave and a particle (photon).
Which part of the EM spectrum is responsible for sunburn?
Ultraviolet (UV) radiation
What are some practical applications of X-rays?
Medical imaging, security screening.
Do EM waves carry energy?
Yes, they carry energy and momentum.
What causes electromagnetic waves?
Accelerating charges
Which end of the EM spectrum has the longest wavelength and lowest frequency?
Radio waves
What is the speed of electromagnetic waves in a vacuum?
The speed of light (c), approximately 3 x 10^8 m/s
What does EM stand for in EM Waves?
Electromagnetic
What is the range of wavelengths for visible light?
Approximately 400 nm (violet) to 700 nm (red)
What are some practical applications of infrared radiation?
Remote controls, thermal imaging, night vision.
What is interference of EM waves?
The superposition of two or more waves to form a new wave pattern.
What is the primary difference between different types of electromagnetic waves?
Their wavelength and frequency
How is the energy of a photon related to its frequency?
E = hf, where h is Planck's constant and f is frequency.