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

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

Step-by-step explanation:

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

Answer 2

f = 1 10 8 Hz

Step-by-step 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