basic concept of interference of waves

1. GROUP 3
TEAM MEMBERS :
1. NUR ATIKAH AMIRA BINTI RANI
2. NURFATHIRAH BATRISYIA BINTI AHMAD FAIZAL
3. NUR ANIS AFIQAH BINTI ANIZAM
4. NUR HAKIMAH HANIM BINTI HALIM
5. NADZHATUL SYAHILA BINTI MOHAMMAD NADZRI

3. WHAT IS interference ?
Wave interference
• occurs when two waves meet while traveling along the same
medium
• interference of waves causes the medium to take on a shape,
resulting from the net effect of the two individual waves at the
particles of the medium.
• considered two waves of the same amplitude travelled in
different directions along the medium

4. CONSTRUCTIONOF INTERFERENCE
Constructive interference
• occurs at any location along the medium when two interfering
waves have a displacement in the same direction.
• both waves have an upward displacement; the medium has an
upward displacement greater than the displacement of the two
interfering waves.

5. DESTRUCTIVE INTERFERENCE
Destructive interference
• occurs at any location along the medium
• two interfering waves have a displacement in the
opposite direction.

6. PRODUCTION OF STANDING WAVES
• Standing waves are produced when two identical wave trains travelling in opposite
directions interact with one another (undergo Superposition) to produce a so called
‘Standing Wave Pattern’
• A standing wave pattern always consists of an alternating pattern of nodes and
antinodes
• The animation below representing the standing wave is, in fact, an ‘envelope’
showing that in some areas large ‘motion’ occur (the antinodes) and it other areas no
‘motion’ occur (the nodes)

7. What are Nodes and Antinodes?
Nodes
• points in the standing waves where the two waves cancel –
complete destructive interference – created a stationary point.
• described as points of no displacement.
• A node is a place of zero amplitude

8. Antinodes
• Points in the standing waves half way between the nodes at which largest
amplitude occurs.
• These are the points that undergo the maximum displacement during
each vibrational cycle of the standing wave.
• An antinode is a place of maximum amplitude

9. LETS WATCH THIS VIDEO