Constructive Destructive Interference

Interference. Path difference. Constructive and Destructive Interference.

1.The diagram below shows an arrangement used to demonstrate the interference
of water waves.

a Constructive interference occurs at point A. [1]
What is the path difference of the waves from the gaps S1 and S2?

b The water waves have a wavelength of 3.0 cm. Determine the path
difference for the waves arriving at point B.

Name the type of interference taking place at this point.

[3]

7 (a) Explain the term interference.
....................................................................................................................................
....................................................................................................................................
.......................................................................................................................... [1]
(b) A ripple tank is used to demonstrate interference between water waves.

A wave pattern produced in (b) is shown in Figure

Solid lines on Fig. 1 represent crests.
On Fig. 1,

(i) draw two lines to show where maxima would be seen (label each of
these lines with the letter X), [1]

(ii) (ii) draw one line to show where minima would be seen (label this line
with the letter N). [1]

Q3.The diagram shows the wave fronts of two waves traveling in different directions.

a. How many of its wavelengths has the horizontally traveling wave moved by at
point ?
[1]

b. How many of its wavelengths has the diagonally traveling wave moved by at
point ?
[1]

c. If the horizontal wave at point was to be combined with the diagonal wave
at point ,would the interference be constructive or destructive?
[2]

d. How many of its wavelengths has the horizontally traveling wave moved by at
point ?
[1]

e. How many of its wavelengths has the diagonally traveling wave moved by at
point ?
[1]

f. If the horizontal wave at point was to be combined with the diagonal wave
at point ,would the interference be constructive or destructive?
[2]

g. How many of its wavelengths has the horizontally traveling wave moved by at
point ?
[1]

h. How many of its wavelengths has the diagonally traveling wave moved by at
point ?
[1]

i. If the horizontal wave at point was to be combined with the diagonal wave
at point ,would the interference be constructive or destructive?[1]