Diffraction

PH29.3 Spectroscopy and PH15.4 Diffraction grating

By Jason L.

Multiple Select

When a CD is held at an angle, the reflected light contains many colors. What causes these colors?

• Anti-theft encoding intending to prevent copying the CD.

• The different colors correspond to different data bits.

• Light reflected from the closely spaced grooves.

• It is part of the decorative label on the CD.

Open Ended

How is this spectrum produced from white light?

Open Ended

A grating has 7400 slits/cm. How many visible light (400 nm - 700 nm) spectral orders can be seen when it is illuminated by white light?

Open Ended

How is a spectrometer used to determine elements or compounds?

Open Ended

Red laser light from a He-Ne laser (wavelength=628 nm) creates a second-order fringe at 53.2 degrees after passing through the grating. What is the wavelength of light that creates a first-order fringe at 20.6 degrees?

Open Ended

What does the light from heated solids or dense gaseous objects (like the Sun) produce spectrums but not fringe patterns of a single color?