Light Spectrum on a CD

 

Line Spectra Gallery

  

Spectrum Lab

   

As you can see from the three pictures above, when using the spectrometer towards the sunlight (1), ceiling light (2), and lamp light (3) they each have different emission spectra. 

Reema 

Daylight vs. ceiling light

This is a picture of the spectrometer on daylight/natural light. The colors of the wavelength of the light gradually and seamlessly change from one color to the other without any kind of division. 

To the right is a picture of the spectrometer on a fluorescent ceiling light. The colors of the wavelength are divided and the separation between the colors are distinct. Unlike the colors from natural light which have colors, red to yellow, to green, to light blue, to dark blue, the picture of the fluorescent light only has colors red, green, and blue.

Post and photos: 

Marjorie

Visible spectrum of light

Line Spectra

The purpose of this lab is to measure wavelengths of different light sources using a device called a spectroscope. I have provided sample pictures containing the wavelength measurements of the following light sources taken with a camera through a spectroscope.

Wavelength measurements are measured by nanometers (nm) (x10^9). The purpose of measuring wavelengths is used to specify the strength of the colors measured by their peaks to relate to specific elements on the periodic table of elements. Each element has its own wavelength frequency, and by using a spectroscope you are able to identify which element is present. Astrophysicists and space explorers use this in search of planets for inhabitability and resources. If a planet contains too many poisonous gases it would be identified using spectroscopy and we would better know to avoid landing on those planets or sending humans to explore those planets.
1. Scattered Sunlight

Wavelength Measurements: Red- 6.7nm-6.2nm, Orange- 6.1nm-5.9nm, Yellow- 5.9nm-5.8nm, Green- 5.8nm-5.3nm, Blue- 5.2nm-4.8nm, Indigo- 4.8nm-4.0nm, Violet- 4.0nm->

2. Light Bulb

Wavelength Measurements: Red- 6.1nm, Orange- 6.0nm-5.8nm, Yellow- (not visible), Green- 5.5nm, Blue- 5.0nm-4.8nm, Indigo- 4.4nm, Violet- (not visible)

3. Fluorescent Light

Wavelength Measurements: Red- 6.7nm-6.2nm, Orange-  6.2nm-6.0nm, Yellow- 5.9nm, Green- 5.8nm-5.5nm, Blue- 5.2nm-4.9nm, Indigo- 4.8nm-4.5nm, Violet- 4.4nm

By Nicholas

Spectrometer

The differences between the two observations is the sunlight spectrometer, light blends together and is hard to notice distinct changes where the light bulb shows clear lines and distinct changes through the spectrum.

It is this way due to elements from the sun have much more where light bulbs are artificially made.

In the pictures below the left picture notes that is a picture of spectrometer at the light bulb, where the picture on the right is the sun.We can learn about the bulb or the sun is that there are clear distinctions of measuring in nanometers through the spectrometer.

Gian