Electromagnetic Wave Flashcards
Is a form of energy that humans encounter and utilize in day-to-day activities. It had only been associated with visible light until scientists discovered its other types, which differ in frequency and wavelength.
Electromagnetic Radiation
Primarily comes from extremely hot astronomical objects such as the sun.
Electromagnetic Radiation
Is energy that is emitted by accelerating charged particles that produce oscillating electric and magnetic fields. It travels through space or a material medium in the form of electromagnetic waves.
Electromagnetic Radiation
The highest point of a transverse wave is the?
Crest
The lowest point of a transverse wave is the?
Trough
The maximum vertical displacement of the wave from its resting or equilibrium position is the?
Amplitude
It is basically the height of the wave.
Amplitude
The distance between two consecutive crests or troughs is the?
Wavelength
Refers to one complete pattern of the wave, from crest to crest or from trough to trough, before the pattern begins again. Thus, the wavelength is the distance the wave travels to complete one cycle.
Wave Cycle
Is the number of cycles that passes a specific point in a given time.
Frequency
Frequency is commonly measured in hertz (Hz). Which is defined as one cycle per second. Hz is from?
Heinrich Hertz
Is the time it takes for a wave cycle to complete. It is expressed in seconds (s).
period T
Studied electromagnetic waves and calculated that their speed is identical to the speed of light.
Scottish Physicist James Clerk Maxwell
Speed of Light?
3.0x10^8 m/s
The seven regions of the electromagnetic spectrum are the?
Radio waves, microwaves, infrared radiation, visible light, ultraviolet (UV) radiation, X-rays, and gamma rays.
Are produce by accelerating charges in conducting wires due to variation in current. It has the longest wavelengths and the lowest frequencies
Radio Waves
Electromagnetic radiation encompasses a range of energies that has distinct wavelengths and frequencies known as the?
Electromagnetic Spectrum
Cover a wide range of wavelengths that extends over several bands. They have the longest wavelengths, from a few meters to kilometers.
Radio Waves
Had mathematically predicted the existence of radio waves in 1867.
James Clerk Maxwell
Confirmed James Clerk Maxwell prediction in 1887.
German Physicist Heinrich Hertz (1857-1894)
He sent and received the first transatlantic wireless message in 1901.
Italian Inventor Guglielmo Marconi (1874-1937)
Guglielmo Marconi was awarded the Nobel Prize in Physics in 1909 for his work with the development of wireless telegraphy along with?
German Inventor and Physicist Karl Ferdinand Braun (1850-1918)
Is facilitated by radio and TV transmitters. which operate on two basic transformations.
Transmission
Are commonly used in communication.
Radio Waves
The transmission and reception of radio waves rely on?
Oscillating Charges
The conversion of electrical energy into electromagnetic energy in the antenna wire of transmitters.
Second
Is the transformation of sound energy and light energy into electrical energy.
First
Is a specially shaped crystal. When white light shines through it, the light is separated into all its colors.
Prism
Are waves with frequency higher than those of radio waves. They are used in satellites communications, RADAR, Mobile phones, networks and for cooking.
Microwaves
RADAR means?
Radio Detecting and Ranging
Can be used in cooking and heating. The invention of it has reduced to one-fourth the usual cooking time as compared when using electric ovens.
Microwaves
Have a shorter wavelength, from .001 m to 700 nm, and therefore, has a higher frequency.
Infrared Radiation
The term infrared is a latin word in which infra means?
Below
Infrared radiation in 1880 was discovered by?
Wilhelm Herschel
Is the colour with the longest wavelength in the visible spectrum, therefore, it is known as infrared.
Red
LASER means?
Light Amplifications by Stimulated Emission of Radiations
Wavelengths range from 400 nm to 10 nm; the frequency (and therefore the energy) is high enough with UV rays to penetrate living cells and cause them damage.
Ultraviolet Light
A year after Herschel discovered infrared radiation, he discovered ultraviolet (UV) light.
German Chemist Johann Wilhelm Ritter (1776-1810)
Wavelengths range from 700 nm (red light) to 30 nm (violet light) with frequencies higher than infrared waves.
Visible Light
Have short wavelengths with high frequencies. These rays have enough energy to penetrate deep into tissues and cause damage to cells; and stopped by dense materials, such as bone.
X-ray
X-rays were discovered accidentally by?
German Physicist Wilhelm Roentgen (1845-1923) in 1895
Can be harmful because they produce ionizing radiation, which can damage DNA and living tissue.
X-ray
Can weaken bones, making them more likely to break.
Radiation
When DNA is damaged by radiation, it can lead to?
Cancer or Death
Carry the most energy and have the shortest wavelengths but have highest frequency.
Gamm Rays
Forms of electromagnetic radiation, where radiation can be found?
Ultraviolet Light and X-rays
