| Date | May 2013 | Marks available | 2 | Reference code | 13M.3.SL.TZ1.3 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Describe | Question number | 3 | Adapted from | N/A |
Question
This question is about standing waves in a vibrating string.
A guitar string vibrates at 330 Hz in its fundamental mode.
Describe the formation of standing waves in a string fixed at both ends.
[2]
a.
The length of the string is 0.64 m. Calculate the velocity of the wave in the string.
[2]
b.
Markscheme
wave travels down string and is reflected / OWTTE;
incident and reflected waves interfere/add/superpose to give a standing wave;
a.
λ = 2L = 1.28 (m);
v = λƒ = 420 (ms-1);
Award [2] for bald correct answer.
b.
Examiners report
(a) and (b) were well done in general, though many forgot to multiply the length by 2 to obtain the wavelength in (b).
a.
(a) and (b) were well done in general, though many forgot to multiply the length by 2 to obtain the wavelength in (b).
b.
