1. Interference and Resonance
Textbook: 14.4 – 14.5
Homework: WS

2. Standing Waves
The distance between nodes dn is:

3. Standing Waves
A standing wave is formed when two identical waves traveling in opposite directions interfere
A node is a point that does not vibrate
An antinode is a “supercrest/trough”
The distance between nodes dn is:

5. Draw a scale diagram of a standing wave pattern on an 8
Draw a scale diagram of a standing wave pattern on an 8.0-m rope with four antinodes between the ends. What is the wavelength of the waves that produced the pattern?

6. Ex. A standing wave has a distance of 45 cm between four consecutive nodes. What is the wavelength of the wave? What is the speed of the wave in the medium if the frequency of the source is 30 Hz?

7. Resonance
Ex. Swings

8. Resonance
All objects have a natural frequency they like to vibrate at (sets up standing waves)
Mechanical Resonance is the vibrating response of an object to a periodic force that has the same frequency as the natural frequency of the object
Ex. Swings