HubbleSite - Reference Desk - FAQs
Electromagnetic radiation is a type of energy that is commonly known as light. at the same speed which is about * meters per second through a vacuum . we measure it as the distance between any two consecutive peaks of a wave. in waves, we can also talk about frequency, or the number of wavelengths that . Electromagnetic waves always travel at the same speed (, km per this relationship to figure out the wavelength or frequency of any electromagnetic. (Speed of light: x m s-1); Wavelengths are measured between the distances of either crests or This wavelength frequently relationship is characterized by: Shorter wavelength means greater frequency, and greater For Electromagnetic wave, the velocity in vacuum is \( \times.
Constructive interference occurs when two or more waves are in phase and and their displacements add to produce a higher amplitude.
On the contrary, destructive interference occurs when two or more waves are out of phase and their displacements negate each other to produce lower amplitude. Constructive and Destructive Interference Interference can be demonstrated effectively through the double slit experiment. This experiment consists of a light source pointing toward a plate with one slit and a second plate with two slits. As the light travels through the slits, we notice bands of alternating intensity on the wall behind the second plate.RELATION BETWEEN VELOCITY, FREQUENCY AND WAVELENGTH
The banding in the middle is the most intense because the two waves are perfectly in phase at that point and thus constructively interfere. The dark bands are caused by out of phase waves which result in destructive interference. This is why you observe nodes on figure 4. In a similar way, if electrons are used instead of light, electrons will be represented both as waves and particles. As a wave, it is represented by velocity, wavelength, and frequency.
How are frequency and wavelength related?
Light is an EM wave since the speed of EM waves is the same as the speed of light. As a particle, EM is represented as a photon, which transports energy. When a photon is absorbed, the electron can be moved up or down an energy level. When it moves up, it absorbs energy, when it moves down, energy is released.
Thus, since each atom has its own distinct set of energy levels, each element emits and absorbs different frequencies. Photons with higher energies produce shorter wavelengths and photons with lower energies produce longer wavelengths.
Photon Before and After Emission Ionizing and Non-Ionizing Radiation Electromagnetic Radiation is also categorized into two groups based, ionizing and non-ionizing, on the severity of the radiation.
Ionizing radiation holds a great amount of energy to remove electrons and cause the matter to become ionized. Thus, higher frequency waves such as the X-rays and gamma-rays have ionizing radiation. However, lower frequency waves such as radio waves, do not have ionizing radiation and are grouped as non-ionizing. Electromagnetic Radiation and Temperature Electromagnetic radiation released is related to the temperature of the body.
This is an example of a shorter wavelength. Like we said earlier, if you were an observer standing on the black line, and you were so quick that you could count the number of wave peaks that passed you in one second, you would find that the number of wave peaks that you counted would be higher than a longer wavelength. This is an example of a longer wavelength.
Suppose you put yourself on the line again and you start clocking the number of wave peaks that pass you. Wait a minute, not nearly so many wave peaks have gone by in one second like before with the shorter wavelength. That means that longer wavelengths have a lower frequency.
How does this relate to the Electromagnetic Spectrum? Like we said before, light can be characterized by its wavelength.
How are the wavelength and frequency of electromagnetic radiation related?
For example, the human eye can detect light at wavelengths between to nanometers. That is why we call this part of the electromagnetic spectrum visible light. Light waves with shorter wavelengths and higher frequencies also have more energy, so types of light like gamma rays, X-rays, and ultraviolet light are more energetic than visible light, and infrared, microwaves, and radio waves are less energetic than the light in the visible spectrum.