To calculate energy from frequency (or vice Versa)‚ use the following equation E=hn where E is Energy in Joules (J) n is frequency in hertz‚ 1/s or s-1 h=6.626 x 10-34 J s Typical Question #1- How much energy does a photon of light with a frequency of 4.60 x 1014 s-1
Premium Fundamental physics concepts Wavelength Hertz
Light Emitting Diodes (LEDs) ELE 432 Assignment # 3 Vijay Kumar Peddinti Light Emitting Diodes Principle Synopsis: To explain the theory and the underlying principle behind the functioning of an LED Brief History: • The first known report of a light-emitting solid-state diode was made in 1907 by the British experimenter H. J. Round. (material.eng.usm.my/stafhome/zainovia/EBB424e/LED1.ppt) • • • • • • In the mid 1920s‚ Russian Oleg Vladimirovich Losev independently created the first LED‚ although
Premium
electromagnetic force acts between electrically charged particles. This force entails that particles with opposite charges attract‚ while like charges repel. The electromagnetic force has an infinite range and involves the exchange of photons. According to quantum electrodynamics‚ photons work on both the microscopic and macroscopic
Premium Proton Electric charge Electromagnetism
you look perfectly at white clothes‚ all the colors are being absorbed by the electron in the atoms of the elements in the dye‚ causing the electrons to become “excited”‚ and emit all frequencies of light back to your eyes. All the energy of the photons red‚ orange‚ yellow‚ blue‚ indigo‚ and violet light is sent right back to the air around the white shirt. So none of the energy is absorbed by atoms and converted into kinetic energy of atoms. Temperature measures the kinetic energy of the atoms.
Premium Light Energy Color
Nuclear weapons cause unimaginable death and destruction. Without a doubt‚ these are the most powerful weapons mankind has ever built. However‚ there is also a scientific side to this weaponry which Teddy Roosevelt may have indeed called very big sticks. Nuclear weapons work by releasing the enormous amounts of energy that are contained in the bonds of atoms. The bonds of atoms can be broken in two ways. The first way is by fission‚ and the second way is by fusion. Fission works by the splitting
Premium Nuclear fission Nuclear weapon Neutron
There are a large number of types of nebula‚ each vastly different from one to another. These types of nebula all have their own speciality in regard to the way they were formed and how they fit their purpose as nebula. The names of these types of nebula are; H-II regions‚ planetary nebula‚ supernova remnants and diffuse nebula. An H-II region is a region of partially ionised gas. What also distinguishes H-II region from the others is that it contains vast amounts of ionised hydrogen‚ meaning it
Premium Star Sun Galaxy
Assignment: Atomic Theory 1. Write the complete symbol and determine the no. of electrons‚ protons and neutrons of the following e- p+ n a.) Oxygen - 8 8 b.) Cesium - 55 55 c.) Argon - 18 18 d.) Uranium - 92 92 e.) Copper - 29 29 2. Calculate the atomic mass of sulfur from its natural isotope. f.) Sulfur-36 g.) Sulfur-32 h.) Sulfur-33 i.) Sulfur-34 3. Complete this table. Symbol of Elements | Atomic Number | Atomic Mass
Premium Atom Electron Neutron
traveling in a straight line. Lenses and mirrors redirect these rays along predictable paths. Wave effects are insignificant in an incoherent‚ large scale optical system because the light waves are randomly distributed and there are plenty of photons. Short wavelength UV light exhibits more quantum properties than its visible and infrared counterparts. Ultraviolet light is arbitrarily broken down into three bands‚ according to its anecdotal effects. UV-A is the least harmful and most commonly
Premium Electromagnetic radiation Electromagnetic spectrum Ultraviolet
injected into the patient‚ and it accumulates in tissues. As the atoms in the compound decay‚ they release positrons‚ which‚ when they collide with electrons‚ both the electrons and positrons are annihilated‚ and two photons (light particles) are emitted. (See the image on the right). The photons are picked up by a detector ring on the PET scanner‚ and the computer uses the information to generate three-dimensional images that represent the bioactivity where the compound accumulated and released light (Christenson
Premium Nuclear fission Nuclear power Uranium
For thousands of years‚ humans relied on their intuition to understand how the world works. Sure‚ the approach may have led to a few mistakes along the way -- it turns out the Earth isn’t flat‚ for instance -- but ultimately it worked fairly well. Slowly but surely‚ humanity gained an understanding of everything from the laws of motion to thermodynamics‚ and all of it made intuitive sense. And then quantum mechanics came‚ the absolutely baffling branch of physics exploring the very smallest types
Premium