Question

Red light of wavelength 633 nmnm from a helium-neon laser passes through a slit 0.300 mmmm wide. The diffraction pattern is observed on a screen 3.70 mm away. Define the width of a bright fringe as the distance between the minima on either side.

Answer 1

Answer:

 f = 1 10 8 Hz

Explanation:

The speed of an electromagnetic wave is given by

         c = λ f

In our case, the wavelength is 3.0 m, so we can clear the frequency

         f = c /λ

         f = 3 10⁸/3.

          f = 1 10 8 Hz

Answer 2

Answer:

Sin∅ =  λ/a

        = 633×$10^{-9}$ / 3×$10^{-4}$

        = 2.11×$10^{-3}$

then 2y = 4.22m

y = 2.11m

then sin∅ = y/1.00m

                 = 2.11/ 1

         sin∅ = 2

Explanation:

the calculation follows the diffraction process where we look at the diffration on the screen at the certain angle.