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What Is the Equation to Calculate the Speed of Light and Energy?

The speed of light in a vacuum is a fixed, universal constant: c = 3.00x10^8 m/s, to three significant digits. The relationship between the speed of an electromagnetic wave, its frequency and wavelength is given by: c = f ..... where f is frequency and is the wavelength The energy of an electromagnetic wave is given by: E = h f ... where h = Planck's constant, 6.63x10^-34 Js Since f = c / we can make the following substitution and get: E = hc /

1. How do light bulbs convert energy from eletrical energy to light energy?

Upon tuning on the light, an electrical voltage difference exists across a component of the light bulb called the filament. The filament is nothing more than a tiny jumble of tungsten wire, which is surrounded by Argon to prevent chemical reactions. This voltage difference causes a corresponding electrical current to flow through the filament. The product of the voltage difference and the current flow gives us the rate at which electrical energy is consumed by the bulb. When the electrical energy is consumed by the bulb, it heats the filament due to the resistive heating effect. When the filament reaches a steady state temperature, it is emitting this amount of energy as thermal radiation. Because the filament is hot enough (2600 Kelvin), the spectrum of the radiation includes some visible light, while mostly infrared. The glass lets through all the visible light and some high frequency IR, but absorbs much of the IR and converts to heat. For this reason, the light bulb glass gets hot when operated. Summary: electrical energy is converted to thermal energy via the resistive nature of the tungsten filament. This thermal energy is emitted as radiation by the filament in order to maintain a steady state temperature. Because the filament is hot enough, some of the spectrum of emitted radiation is visible, while the rest eventually manifests as heat, whether in the glass or upon striking our skin.

2. light energy question?

it does makes sense, the solar cells can be placed in an area of land and the power generated from it can be transferred to the houses.so, it depends on how many square miles of photocells u need to generate 250000kW power

3. Whats the diff between light energy and light frequency?

Light frequency is the specific vibrational number that also specifies the color. Shorter wave lengths have higher frequency so Blue and UV have higher frequency than Red and IR. The energy in the photons goes up with frequency.

4. What exactly is Light Energy?

Energy can not be created or destroyed, it just changes form in the form of light, or heat. A law of physics, this can be proven by lighting a fire cracker. Potential energy is ignited (excited) and is transformed into light, and heat energy, "BANG", and it's a flash of light, and heat energy.

5. What SI unit is used to express light energy, and how is this unit converted into joules?

The SI unit of light energy is the joule.One of the major points of using the SI is that it supports a coherent system of measurement, avoiding weird conversion factors between units measuring the same quantity.There does appear to be some confusion about what the questioner intends. Regarding Mike Schneids' answer to What SI unit is used to express light energy, and how is this unit converted into joules?, energy in electron volts is commonly used to describe the energy of an individual photon, but is rarely used more generally to describe "light energy". Furthermore, in the jargon of International System of Units - Wikipedia, the electron volt is a "non-SI unit whose value in SI units must be obtained experimentally". In other words eV is not an SI unit.However, while radiant energy is measured (like any other form of energy) in joules, SI also includes the concept of luminous energy.Luminous energy is the perceived quantity of light, related to how bright it appears to a typical human observer. The unit is lumen-second (lm cdot s). The actual energy in joules is weighted by the human photopic response or luminosity function.Luminosity function - WikipediaPhotopic (black) and scotopic (green) luminosity functions. The photopic includes the CIE 1931 standard (solid), the Judd-Vos 1978 modified data (dashed), and the Sharpe, Stockman, Jagla & Jgle 2005 data (dotted). The horizontal axis is wavelength in nm. The luminosity function V(lambda) has peak value equal to unity at wavelength lambda 555 nm.Luminous energy in lumen-seconds depends on the spectral distribution q_e,lambda of radiant energy: Q_V = K_m int V(lambda) q_e,lambda dlambda The conversion factor between lumens and watts, or between lumen-seconds and joules is K_m = 683.002 , lm , W^-1Conversion is trivial for monochromatic light with frequency 540 THz (550. 016 nm) for which the conversion factor is defined to be 683 lm/W exactly. More generally, the spectral distribution must be accounted for, using the integral equation for Q_V above.What SI unit is used to express light energy, and how is this unit converted into joules?.

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