FOLLOW US ON TWITTER
SHARE THIS PAGE ON FACEBOOK, TWITTER, WHATSAPP ... USING THE BUTTONS ON THE LEFT


YOUR PARTICIPATION FOR THE GROWTH OF PHYSICS REFERENCE BLOG

Saturday, June 24, 2017

What, to two significant figures, are the period, the frequency and the amplitude of the wave represented by the graph?






Question 1
What, to two significant figures, are the period, the frequency and the amplitude of the wave represented by the graph?


period / s        frequency / Hz           amplitude / m
A          0.0027             370                              0.0067
B          0.0031             320                              0.013
C         0.0035             290                              0.0067
D         0.0042             240                              0.013





Reference: Past Exam Paper – June 2014 Paper 12 Q22





Solution:
Answer: C.
A graph of displacement against time is given. The y-axis gives displacement in ‘m’ and the x-axis gives time in ‘ms’.

Period can be directly obtained from the time axis.
3.5 waves correspond to 12.1 ms.
3.5 T = 12.1×10-3 s
Period T = 12.1×10-3 / 3.5 = 0.0035 s

Frequency = 1 / T = 1 / 0.0035 = 290 Hz

Amplitude is the maximum displacement. This can be obtained from the y-axis.
Amplitude = 6.7 mm = 0.0067 m

No comments:

Post a Comment

If it's a past exam question, do not include links to the paper. Only the reference.
Comments will only be published after moderation

Currently Viewing: Physics Reference | What, to two significant figures, are the period, the frequency and the amplitude of the wave represented by the graph?