13-General Wave Properties, Paper 2 (Section A)

Question 1

(b) Describe how the frequency of the wave is found using a stopwatch
(c) Using the same rope, the student produces a wave of a longer wavelength than that shown in fig 4.1
State how the student does this

Answer 1

(b) measure number of oscillations/ count waves (passing) in a stated time or time at least one oscillation
show how to calculate number of oscillation per second
(c) moves (hand or rope) with slow(er) speed or rate/ less frequency/ less times per sec

Question 2

(a) Explain the difference between a longitudinal a wave a transverse wave
(b) A sound wave has frequency of 3.8 kHz and speed of 330 m/s
i) calculate the wavelength of the sound

Answer 2

(a) Transverse wave are waves whose direction of vibration is perpendicular to its direction of the wave motion whereas longitudinal waves are waves whose direction of vibration is parallel to its direction of the wave motion. Compression and rarefactions travel along the direction of propagation
(b) velocity = f x lamda
lamda = v/f
= 330 m/s/3.8 Hz
=330/3800
= 0.0868
~0.087