# Worksheet: Double-Slit Interference

In this worksheet, we will practice calculating different light intensities wavelengths at variable angles relative to a double-slit's transmission axis.

**Q8: **

Light of wavelength 710 μm illuminates a double slit with a slit separation of 0.150 m. Light from the slits is incident on a screen 3.00 m away.

Find the distance on the screen between the central maximum and the third maximum of the diffraction pattern.

Find the distance on the screen between the second maximum and the fourth maximum of the diffraction pattern.

**Q20: **

An effect analogous to two-slit interference can occur with sound waves instead of light. In an open field, two speakers, placed 2.10 m apart, are powered by a single function generator producing sine waves at a 1,790 Hz frequency. A student walks along a line 15.3 m away from and parallel to the line between the speakers. The student hears an alternating pattern of louder and quieter sounds due to constructive and destructive interference.

What is the wavelength of the sound, given that the speed of sound equals 343 m/s?

What is the distance between the central maximum and the fifth-order maximum position along this line?