5. Using the two-dimensional wave interference pattern shown, a student makes the following

measurements (note that diagram may no be to scale when printed). (8 marks)

S.

For the point on the second notal line (n=2),

P₂S₁

P2S₂

37 mm

= 46 mm

For the point on the first anti-nodal line (m = 1),

P₁S₁

P₁S₂

= 41 mm

= 35 mm

a)

Calculate the wavelength based on measurements for the point on the second nodal line.

Calculate the wavelength based on measurements for the point on the first anti-nodal line.

c) What effect would an increase in frequency have on the interference pattern?

b)

d)

What effect would a decrease in the distance between the wave sources have on the

interference pattern?