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The energy spectral density describes how the energy (or variance) of a signal or a time series is distributed with frequency.
You can read more in Wikipedia 'Spectral Density', but you will need good maths to understand it!
Josianne Prohaska
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What causes the emission of radiant energy that produces characteristics spectral lines?
When the electrons absorb energy from a source, such as heat, they move to an excited state (farther from the atoms nucleus). They then release the energy in the form of light which produces the observed spectral lines of color. Once the energy is released, the electrons move back to a lower energy level (ground state).
Which solid element has the lowest density?
The solid element that has the lowest density is lithium. Its density is 0.534 grams per cubic centimeters. Lithium is a metal, and it does not occur freely in nature.
Does density and volume change the ability to change energy?
yes because density = volume/mass
What is average electric energy density when a plane electromagnetic wave travels in vacuum?
The average energy density is pressure P=S/c= E2/zc = DE = hc/r4.
How is density affected by thermal energy?
Density determines how far apart molecules of a material are from one another, i.e. Density is the mass per unit of space. Due to this, density is related to the rate of heat transfer or thermal energy transfer. Thermal energy being transferred relies on the difference in the internal energy of molecules, mostly kinetic energy, as when heat is transferred, these molecules exchange energy by hitting into each other. By doing so, eventually thermal equilibrium is established. Summary - Density is related to the rate of heat transfer between two systems.
What is spectral density per unit bandwidth?
it states the power and energy of a given signal in terms of frequency
What is power spectral density?
power spectral density (PSD), which describes how the power of a signal or time series is distributed with frequency. Here power can be the actual physical power, or more often, for convenience with abstract signals, can be defined as the squared value of the signal, that is, as the actual power if the signal was a voltage applied to a 1-ohm load.Since a signal with nonzero average power is not square integrable, the Fourier transforms do not exist in this case. Fortunately, the Wiener-Khinchin theorem provides a simple alternative. The PSD is the Fourier transform of the autocorrelation function, R(Ï„), of the signal if the signal can be treated as a wide-sense stationary random process.The power of the signal in a given frequency band can be calculated by integrating over positive and negative frequencies.The power spectral density of a signal exists if and only if the signal is a wide-sense stationary process. If the signal is not stationary, then the autocorrelation function must be a function of two variables, so no PSD exists, but similar techniques may be used to estimate a time-varying spectral density.
What do you call when the different spectral color are mixed?
energy..
What has the author Andrew Gerzso written?
Andrew Gerzso has written: 'Density of spectral components'
How does the spectral interference differ in inductively-coupled plasma mass spectrometry compared to flame?
Spectral interference occurs when spectral lines overlap. Inductively-coupled plasma mass spectrometry has more spectral interference as its higher energy allows more electron transitions.
What properties does ice have that are not shared with liquid water?
For example the density, refractive index, state of matter, spectral properties etc.
What is spectral distribution of cosmic microwave background radiation?
The spectral energy distribution of the microwave background radiation found in the universe is that of a perfectly absorbing body (blackbody) radiating at 2.70 Kelvin.
Why FMCW radar has better range resolution than CW radar?
FM CW radar sweeps the Radio Frequency over time. Time in Radar equates to range and results in a high spectral density at every range. CW radar has a much lower spectral density and does not code range with frequency in the same way.
What causes the emission of radiant energy that produces characteristics spectral lines?
When the electrons absorb energy from a source, such as heat, they move to an excited state (farther from the atoms nucleus). They then release the energy in the form of light which produces the observed spectral lines of color. Once the energy is released, the electrons move back to a lower energy level (ground state).
Spectral lines produced from the radiant energy emitted from excited atoms are thought to be due to the movements of electrons?
From higher to lower energy levels
What is difference in energy density and power density?
Energy density is the amount of power that can be stored ( in for example capacitance) to be then consumed over time, whereas power density is how much energy is consumed quickly like the energy stored in a capacitance can be consumed very quickly.
What causes the emission of radiant energy that produces spectral lines?
The cause is the transition of electrons after the interaction with a photon.
