Electromagnetic Flashcards
Lowest wavelengths and lowest frequencies of all the electromagnetic waves
Radiowaves
Found at the minimum end of the electromagnetic spectrum frequencies ranging from 30 gigahertz to 3 kilohertz
Radiowaves
Who discovered radiowaves
Heinrich Hertz (late 1880s)
Radiowaves are naturally emitted by lightning and astronomical objects
True
Rest smack dab in the middle of radiowaves and infrared waves and have frequency between 3 GHz and 30 THz
Microwaves
Who discovered microwaves
James clerk Maxwell (1864)
Natural sources such as the sun and the cosmic microwave background (artificial devices such as circuits, transmission towers)
True microwaves
Completely invincible to the human eye, they can be felt as heat, frequency from 30 THz to 400 THz
Infrared
Who discovered infrared
William Herschel (1800)
How do William discovered infrared?
He conducted an experiment measuring the difference in temperature between the colors in the visible spectrum , results showed an increase in temperature from blue to red
Any object which has temperature radiates infrared (any object that has temperature above absolute 0)
True infrared
Part of the electromagnetic wave spectrum that our human eyes can behold
Visible light
Who discovered visible light
Isaac Newton (17th century)
Roger Bacon (13th century)
Natural artificial (primarily fluorescent and incandescent tungsten devices in visible light
True visible light
Beyond the visible light spectrum, we get into ___ which occurs at high frequencies sending more than 1k trillion cycles every second
UltraViolet
Who discovered UltraViolet
Johann Ritter (1801)
Uv rays and effect In skin
UVC RAYS
UVB RAYS
UVA RAYS
UVC - SHORTEST WAVELENGTH do not penetrate on earths ozone layer
UVB - LONGER WAVES
Skin effects like tanning,burning
UVA - EVEN LONGER WAVES
Skin cancer
Sunlight is the greatest source of uv radiation
True UltraViolet
So short that they’ll go flying past a given point at 1 million trillion wavelengths per second
X-ray
Who discovered x-ray
Wilhelm roentgen (1895)
Beasts of the electromagnetic spectrum and wield enough power to break the bonds between molecules
Gammarays
Who discovered gammarays
Paul Villard (1900)
Gammarays can come from natural sources such as radon gas, radioactive elements in the Earth and cosmic rays
True gammarays
