12 : Waves 2

Question 1

Formation of stationary waves

Answer 1

Two progressive waves with the same frequency travelling I. Opposite directions are superposed.
- antiphase = node
- in phase = antinode
Separation between two adjacent nodes is half the wavelength

Question 2

Harmonics

Answer 2

Fundamental frequency is the minimum frequency of a stationary wave for a string
- at 2f0 wavelength is 1/2 wavelength at f0

Question 3

Stationary waves in open tube

Answer 3

Antinode at each end
- all integer multiples of the fundamental frequency are possible in an open tube