The Physics of Light & Sound
PROBLEM SET 7
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Wednesday, May 25. Feel free to work together in
groups or to consult with your instructor. These exercises are for your b
The Physics of Light & Sound
PROBLEM SET 6
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Tuesday, May 24. Feel free to work together in groups or
to consult with your instructor. These exercises are for your ben
T he Physics of
L ight & Sound
Mersennes Laws &
Longitudinal Standing
Waves
Drs. Paulson and Scully
GSCI 121 Summer
Standing Waves
Standing waves are characterized by nodes and
antinodes.
Nodes are areas where destructive
interference takes place while a
T he Physics of
L ight & Sound
Standing Waves &
Overtones
Drs. Paulson and
Scully
Reflection of Waves
The string pulls upward on the end of the string. The end
cant move so according to Newton's third law, the wall
must be exerting an equal downward force
T he Physics of
L ight & Sound
Sound Waves
Drs. Paulson and
Scully
GSCI 121 Spring 2011
Sound I ntensity
I
live near the Charlottesville Pavillion and
frequently walk by concerts. As I get further away,
the sound quality seems to get worse and worse.
Why?
T he Physics of
L ight & Sound
Timbre, Sound
Power and Sound
Intensity
Drs. Paulson and
Scully
H ow do we tell what
instrument?
Timbre
Waveform
How the sound starts
Attack Transients
Attack Transients
From a Pipe Organ
From a pipe organ
W hat is Each
F
The Physics of Light &
Sound
Sound Waves
& the Speed
of Sound
Click to edit Master subtitle style
6/2/11
Speed of Sound
The speed of sound within a medium
generally depends on the stiffness of
the medium and the density of the
medium.
The speed of sound
The Physics of Light & Sound
WEEK 3 LECTURES
GSCI 121 SUMMER 2011
Standing Waves
A standing wave is a wave that appears to remain in a constant position. It usually results in a stationary
medium (such as air or on a string) as a result of interference be
The Physics of Light & Sound
PROBLEM SET 11
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Thursday, June 2. Feel free to work together in groups
or to consult with your instructor. These exercises are for your b
The Physics of Light & Sound
PROBLEM SET 10
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Wednesday, June 1. Feel free to work together in groups
or to consult with your instructor. These exercises are for your
The Physics of Light & Sound
PROBLEM SET 9
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Tuesday, May 31. Feel free to work together in groups or
to consult with your instructor. These exercises are for your ben
The Physics of Light & Sound
PROBLEM SET 8
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Thursday, May 26. Feel free to work together in groups
or to consult with your instructor. These exercises are for your be
The Physics of Light & Sound
PROBLEM SET 6
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Tuesday, May 24. Feel free to work together in groups or
to consult with your instructor. These exercises are for your ben
The Physics of Light & Sound
PROBLEM SET 5
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Monday, May 23. Feel free to work together in groups
or to consult with your instructor. These exercises are for your bene
The Physics of Light & Sound
PRACTICE PROBLEMS
GENERAL SCIENCE 121 SUMMER 2011
1. A string xed at both ends has a length of 4 m has a wave speed of 10 m/s. Compute the
frequency of the 4th harmonic. ANSWER: 5 Hz
2. The fundamental frequency of a stretched
The Physics of Light & Sound
PRACTICE PROBLEMS
GENERAL SCIENCE 121 SUMMER 2011
1. A pendulum on the Earths surface has a bob of length 0.2 m. What is the natural frequency in Hz
Sean T
11
of this system? ANSWER: 1.11 Scully - GSCI121_3_4_SP10
Hz
Homework
The Physics of Light & Sound
LAB 09: THE DOPPLER EFFECT
GENERAL SCIENCE 121 SUMMER 2011
Introduction
The Doppler effect (or Doppler shift) is the change in frequency of a wave for an observer moving
relative to the source of the waves. It is commonly hear
The Physics of Light & Sound
LAB 08: MEASURING SOUND LEVELS
GENERAL SCIENCE 121 SUMMER 2011
Introduction
In this experiment you will measure several sound levels and will investigate how they can be added
together. The sound level is related to the intens
The Physics of Light & Sound
LAB 07: SPEED OF SOUND
GENERAL SCIENCE 121 SUMMER 2011
Introduction
Compared to most objects, sound waves travel very fast. It is fast enough that measuring the speed
of sound is a technical challenge. One method you could use
The Physics of Light & Sound
LAB 06: WAVES
GENERAL SCIENCE 121 SUMMER 2011
Introduction
In this lab you will investigate sound waves and their properties using the WAVEPORT software
(PASCO scientic). Using WAVEPORT you will modify the pre-dened tones, inv
The Physics of Light & Sound
LAB 05: THE PENDULUM
GENERAL SCIENCE 121 SUMMER 2011
Introduction
One of the more important types of motion encountered in nature
(responsible for the creation of sound, light, as well as other
phenomena) is the oscillatory mo
T he Physics of
L ight & Sound
Position, Speed &
Acceleration
Drs. S. Scully and S.
Paulson
Units & Conversions
We
will
adopt
the
metric system
of
measurement.
We will use the SI system
(kilograms, meters, seconds).
Prefix
giga
Figures
1,000,000,000
Scie
T he Physics of
L ight & Sound
Forces
Drs. Paulson and Scully
GSCI 121 Summer 2011
Lecture 2
Acceleration due
to gravity
If I drop two objects of different mass from
the same height, which one hits the ground
first?
It was Galileo who
reasoned that both
T he Physics of
L ight & Sound
Work, Energy &
Power
Drs. Paulson and
Scully
Pressure
If I stand on some soft ground, I sink. There is a net
force: my weight overcomes the grounds normal
force.
Now suppose instead I lie on the same ground but I
do not si
The Physics of Light & Sound
PROBLEM SET 2
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Tuesday, May 17. Feel free to work together in groups or
to consult with your instructor. These exercises are for your ben
The Physics of Light & Sound
PROBLEM SET 3
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Wednesday, May 18. Feel free to work together in
groups or to consult with your instructor. These exercises are for your b
The Physics of Light & Sound
PROBLEM SET 4
GENERAL SCIENCE 121 SUMMER 2011
Instructions
Complete the following exercises in class on Thursday, May 19. Feel free to work together in groups
or to consult with your instructor. These exercises are for your be
Sean T Scully - GSCI121_3_4_SP10
3
Problems from the Whole Course
Sean T Scully - GSCI121_3_4_SP10
3
Problems from the Whole Course
Suppose that a radio signal travels through space at a speed of
3 108 m/s. How far does the signal travel after 29 minutes?
The Physics of Light & Sound
LAB 02: HOOKES LAW
GENERAL SCIENCE 121 SUMMER 2011
Introduction
A number of materials in nature have the following property: when stretched, compressed, or
otherwise deformed by an external force they regain their previous sha
The Physics of Light & Sound
LAB 03: CONSERVATION OF ENERGY
GENERAL SCIENCE 121 SUMMER 2011
Introduction
Energy is a physical quantity that is conserved in our universe. This can be stated as follows: Energy
cannot be created nor destroyed. The exception