Two common sources of continuous spectra used in emission spectroscopy are the electrical discharge lamps and the incandescent lamps. Electrical discharge lamps, such as the mercury vapor lamps, produce continuous spectra due to the excitation of atoms or molecules in the gas discharge. Incandescent lamps, on the other hand, produce continuous spectra because of the thermal emission from the hot filament.

The peak at 800nm in fluorescence spectroscopy is typically associated with the emission of fluorescence from a sample. At this wavelength, the sample emits light as a result of excitation by a specific wavelength, usually in the visible range of the electromagnetic spectrum. The shape, intensity, and position of the peak can provide insights into the characteristics of the sample, such as its structure, composition, or interactions with other molecules.

Flame emission spectroscopy is commonly used in situations where the elemental composition of a sample needs to be determined. It is frequently employed in environmental monitoring to analyze trace elements in water and soil samples. It is also utilized in metallurgical and pharmaceutical industries, as well as in forensic analysis to identify the presence of specific elements in crime scene evidence.

Track IR is a hardware device developed by NaturalPoint that allows users to track their head movement in order to control the perspective in video games and simulators. It uses infrared technology to track the position and rotation of the user's head, allowing for a more immersive and natural gaming experience.

Unless you're truly nitpicky, there's no real difference at least in the way the terms are used these days.

Historically, the endings make reference to slightly different processes -- Photography vs photometry is about collecting the light vs measuring it; however spectrometry pretty much had to collect photons from the beginning so the line between the two is blurred.

Outside light-measurements, the -metry ending appears more common in practice (as in "mass-spectrometer") but there, too, usage is not always consistent.

BTW there's a third term, spectrography, which is also used mostly interchangably with the other two these days.

(Note that there are in principle IUPAC norms and any one peer-reviewed journal may just have an editor that is hidebound enough to care about such subtle distinctions -- however using any one of the terms will generally be perfectly understood by any practicioner in any of the various fields and a quick scan of the titles of presentations at the last meeting of the American Physical Society shows a fairly even distributions of the terms even in reference to the same experiment).

It Increases. Red light has a wave length of about, 620-750 nm.

Blue light a wave length of about 450-475 nm

Different atoms, particularly carbon, hydrogen, nitrogen and oxygen, made up molecules into such things as proteins, lipids, phospholipids, enzymes, and amino acids. These molecules are part of what makes up a cell, including DNA, and is obviously the first "material" that was first seen in cells.
Cells are made/constructed of many different chemicals, but when were they first seen? In the 1670's, Anton van Leeuwenhoek saw microscopic organisms with a microscope that he had fashioned... but there could have been someone who saw them before that... certainly people who knew of their existence.

Interested in U.S. companies marketing LED light therapy products.

If something is transperent it means that u can see through it, and light can be able to pass through it. If a speach is transparent; it means it was made clearly and so easy for people to understand.

A sharp ding or ringing noise. They say it is music to a goaltender's ears.

Priciple of N.M.R is based upon the spin of nuclei in an external magnetic field.In absence of magnetic field,the nuclear spins are oriented randomly.Once a strong magnetic field is applied they reorient their spins i.e aligned with the field or against the field.Orientation parellel to alignment of applied force is lower in energy.When nuclei are irradiated with RF radiation the lower energy nuclei flip to high state and nuclei said to be in resonance,hence the term nuclear magnetic resonance.

electromagnetic spectrum can be interpreted in the units of frequency i.e. hertz or in the units of wavelength i.e nm

Because emission spectrum are the result of the electron configuration of the element and no two elements have exactly the same electron configuration.

Red peppers are green peppers that have been allowed to ripen.

colour blue ------> red frequency drops, wavelength increases, because speed remains constant and speed=frequency*wavelength

Grating constant is the distance between two rulings present on the grating plate.

The densitometer uses a light bulb. When turned on the bulb emits light that passes thru a filter placed upon a spot of color. The current is known to light the bulb. When the densitometer is used the light is energized over a patch of color, the light passes thru the color to the base material and is reflected back thru the lense to a sensor that converts the light to eletrical current. The densitomiter measures the difference in current from the output of the light and the return and computes a value that becomes the density value

Lava is a natural phenomenon. No-one 'discovered" it. It has occurred since before our ancestors walked upright.

The difference in energy states for the electrons is different in sodium and neon, so they produce different wavelengths (the emission spectrum of each element is different) or colors.

Fundamentally it is the frequency. When light travels into a medium like glass the speed and wavelength can decrease but the frequency and color do not change. If light does not pass thru different mediums then it is safe to talk about its color in terms of either frequency or wavelength (one is inversely proportional to the other by speed of light = frequency x wavelength) but fundamentally one would use frequency.

refraction of light

it was discovered many years ago but Newton was the first who described it in mathematical terms.

disadvantages - radiation can ionize and damage cells and is very expensive to use.

advantages - can go in lots of detail, and results are usually very clear

Yes, colors may be measured.