1
Travelling and Standing Waves
Many biological phenomena are cyclic.
•
Heartbeats
•
Circadian rhythms,
•
Estrus cycles
•
Many more e.g.’s
Such events are best described as waves.
Therefore the study of waves is a major
component of this biophysics course.
Sound Waves:
Study guide 2
(Acoustics, vibrating strings)
Electromagnetic Waves:
Study guide 3-4
(Light, X-rays, Infra-red)
Quantum Mechanical Waves:
Study guide 4-6
(motion of elementary particles/waves)

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2
MATERIAL TO READ
Web:
http://www.physics.uoguelph.ca/biophysics/
www.physics.uoguelph.ca/tutorials/GOF/
… /tutorials/trig/trigonom.html
… /tutorials/shm/Q.shm.html
Text:
chapter 1, Vibrations and waves
Handbook:
study guide 1
For 1
st
quiz, you should know:
1.
How to evaluate sin(x), cos(x), sin
-1
(x), cos
-1
(x)
2.
Equations for travelling and standing waves
3.
How to graph a wave given the equation
4.
Relations between period (T), frequency (f or
υ
) and wavelength (
λ
)
Type of wave
Form
Sinusoidal
y = Asin(x)
Square
y =
A for 0 < x <
λ
/2,
= -A for
λ
/2
≤
x
≤
λ
Ramp
y = Cx, for -
λ
/2
≤
x
≤
λ
/2
Periodic functions can be described as a sum of
sinusoidal waves.
Therefore we need trigonometry