To calculate the number of photons, you can use the formula: Energy of 1 photon = hc / λ where h is Planck's constant, c is the speed of light, and λ is the wavelength. From this, you can determine the energy of one photon of light with a 4000 pm wavelength and then calculate the number of photons required to provide 1 Joule of energy.
To calculate the number of photons that provide 1J of energy for light with a wavelength of 4000 pm, we need to use the formula E=nhf, where E is the energy, n is the number of photons, h is the Planck's constant, and f is the frequency. First, calculate the frequency using the speed of light formula, c=λf. Then, calculate the energy per photon using E=hf. Finally, divide the total energy by the energy per photon to find the number of photons.
If a certain source emits radiation of a wavelength of 400 nm then the energy in a mole of photons of this radiation can be found using E = hc/w. The energy in kJ/mol of a mole of these photons is approximately 300 kJ / mole.
The velocity of light is constant in a given medium, independent of wavelength. Therefore, the ratio of velocities of light rays with wavelengths 4000 Å and 8000 Å in the same medium is 1:1.
The efficiency of a machine is given by the ratio of useful work output to the energy input. Therefore, if the machine has an efficiency of 91%, the amount being used for work would be 91% of the energy input. In this case, if the energy supplied is 4000 watts, the amount being used for work would be 0.91 * 4000 = 3640 watts.
This is a good question, and one that is of interest to those concerned with the environment. To understand energy in light, we need to understand waves and wavelengths.Consider waves on an ocean - each wave has a high peak and a low trough, and the ocean is an endless cycle of peaks and troughs. If we were to measure the distance from one peak to the next peak, that measurement would describe the length of one wave. This measurement is appropriately called the wavelength. On the ocean, we would likely measure wavelengths in feet or meters.Light travels in waves too, but unlike ocean waves, light waves are so small that we cannot see individual light waves. In fact, light waves are so infinitesimally tiny, we describe light wavelengths in nanometers (a nanometer is one billionth of one meter) or often in Angstroms (1 tenth of a nanometer, or one ten-billionth of one meter).Visible light ranges in wavelength from approximately 4000 Angstroms (blue) to 7000 Angstroms (red). Blue light is therefore carried by waves that are shorter than red light.Ultraviolet light has even shorter waves than blue light (100 to 4000 Angstroms), while at the other end of the spectrum, infrared has even longer waves than red (7000 to 10,000,000 Angstroms).The amount of energy in light is inversely proportional to its wavelength. In other words, as the wavelength of light becomes shorter (more blue), the energy carried by that wave becomes higher. Specifically, the energy calculation for light is:E (hc)/λ,Where h is Planks Constant, C is the speed of light, and λ is the wavelengthWhile we will not concern ourselves with the mathematics here, the following statements help illustrate the relationship between light color and energy:Blue light (4000 Angstroms) has 75% more energy than red light (7000 Angstroms) when both lights are exactly the same brightnessUltraviolet light (1750 Angstroms) has four times more energy than red light of the same brightnessAs an aside, the relationship between light color and energy is what has so many people concerned about the ozone layer. The ozone layer is a very high, very thin layer of ozone (O3), and one interesting property of ozone is that it filters out ultraviolet light. Without the ozone layer, high energy ultraviolet light penetrates the atmosphere, and reaches us on the Earth's surface. Because ultraviolet light carries so much more energy at the same brightness than visible light, it has the potential to cause more damage to our bodies, including cancer.
To calculate the number of photons that provide 1J of energy for light with a wavelength of 4000 pm, we need to use the formula E=nhf, where E is the energy, n is the number of photons, h is the Planck's constant, and f is the frequency. First, calculate the frequency using the speed of light formula, c=λf. Then, calculate the energy per photon using E=hf. Finally, divide the total energy by the energy per photon to find the number of photons.
2.012 x 10^(16)
2.012 x 10^(16)
If a certain source emits radiation of a wavelength of 400 nm then the energy in a mole of photons of this radiation can be found using E = hc/w. The energy in kJ/mol of a mole of these photons is approximately 300 kJ / mole.
In the early period after the Big Bang, the universe consisted of a plasma of nuclei, electrons and photons. These protons were bound in the plasma and not free to move about. About 0.4 million years after the Big Bang, when the universe had cooled to around 4000 K, photons stopped being in thermal equilibrium with matter: the universe became transparent to photons - light could move about.
The ISBN of The Light in the Forest is 1-4000-7788-5.
4000 Angstrom to 8000 Angstrom
The idea here is to calculate 91% of 4000. By the way, technically "watts" is not a unit of energy. It is a unit of power - that is, energy per unit time.
The velocity of light is constant in a given medium, independent of wavelength. Therefore, the ratio of velocities of light rays with wavelengths 4000 Å and 8000 Å in the same medium is 1:1.
3760 / 4000 = 0.94 = 94% efficient
I think its 4000, fred.
The efficiency of a machine is given by the ratio of useful work output to the energy input. Therefore, if the machine has an efficiency of 91%, the amount being used for work would be 91% of the energy input. In this case, if the energy supplied is 4000 watts, the amount being used for work would be 0.91 * 4000 = 3640 watts.