Measure the wavelength of LASER

Unpack the relationship between the frequency, speed and wavelength of a wave.

What, really, is a wavelength and how is it measured? In this STEM lab, high school students work with a laser and diffraction grating to produce a double slit interference pattern. With data they collect, and some math, they solve for the wavelength of a real laser.

Grade Range:
9-12

Duration
60 to 90 Minutes

Supplies

Laser Blox, diffraction grating, ruler or meter stick, pen and paper

NGSS Connections

PS4.B – Electromagnetic Radiation

Use mathematical representations to support a claim regarding the relationships between the frequency, wavelength and speed of waves traveling in various media.

Science and Engineering Practices

Use mathematical representations of phenomena or design solutions to describe and/or support claims and/or explanations