## Why do emission spectra have discrete lines?

Due to the nature of quantum physics, electrons can absorb and emit only specific, discrete energies. Every element has a characteristic arrangement of electron orbitals and energies that dictates what color the emission lines will be.

## Why do we get discrete spectrum instead of a continuous spectrum?

Quick answer: Atomic spectra are continuous because the energy levels of electrons in atoms are quantized. The electrons in an atom can have only certain energy levels. Each packet of energy corresponds to a line in the atomic spectrum. There is nothing between each line, so the spectrum is discontinuous.

Is emission spectrum continuous or discrete?

Moreover, a spectrum of a glowing object is an example of a continuous spectrum while the absorption or emission spectrum of isolated atoms of a chemical element is an example of a discrete spectrum.

### What is a discrete emission spectrum?

With discrete spectra, one sees only bright or dark lines at very distinct and sharply-defined colors (energies). As we’ll discover shortly, discrete spectra with bright lines are called emission spectra, those with dark lines are termed absorption spectra.

### What causes emission lines?

Emission lines occur when the electrons of an excited atom, element or molecule move between energy levels, returning towards the ground state. The spectral lines of a specific element or molecule at rest in a laboratory always occur at the same wavelengths.

Is soft white light continuous or discrete?

White light might be a continuous spectrum, but it’s only part of the electromagnetic spectrum. There are more wavelengths than we can see with our human eyes. A wider continuous spectrum would include radio waves, microwaves and infrared, ultraviolet, x-rays, and gamma rays.

## What is the maximum number of emission lines?

– Therefore the maximum number of emission lines formed when the excited electron of H atom in n = 6 drops to the ground state is 15. – Means an electron forms 15 emission lines when it drops from n = 6 to ground level.

## Are LED lights continuous or discrete?

LED lights, or “Light Emitting Diodes,” as they are better known, emit a continuous spectrum. The spectrum they cover is not as broad as other colored lights or incandescent lights.

Where are emission lines found?

Emission lines are usually seen as bright lines, or lines of increased intensity, on a continuous spectrum. This is seen in galactic spectra where there is a thermal continuum from the combined light of all the stars, plus strong emission line features due to the most common elements such as hydrogen and helium.

### What do emission lines tell us?

From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.

### Is LED light continuous or discrete?

What do you see in a discrete spectrum?

In both of these types of spectra you see spectral features at certain, discrete wavelengths (or colors) and no where else. The type of spectrum you see depends on the temperature of the thin gas. If the thin gas is cooler than the thermal source in the background, you see absorption lines.

## Why does hot gas produce a discrete spectrum?

Light emitted by a hot gas, however, produces a discrete line spectrum. This means that gas atoms emit light only at a few specific wavelengths. The emission lines provide evidence that the energy levels of an atom is quantised, which explains why the atom to is constrained to lose energy only in specific amounts.

## Can you see an emission spectrum from a CD?

Your English is fine. When the sun, or any other light, reflects off of a CD, the rainbow light pattern that you see is an emission spectrum, so you can see an emission spectrum at home simply by holding a CD to some light source. I have also seen people burn salts, such as table salt or KCl in a bunsen burner.

How are emission lines related to absorption lines?

The emission lines provide evidence that the energy levels of an atom is quantised, which explains why the atom to is constrained to lose energy only in specific amounts. When white light is passed through a cool gas, an absorption line spectrum is produced. The dark lines show that the gas atoms can only absorb light at a few specific wavelengths.