# Final Exam Help

1. Jul 21, 2006

### alwysnforevr002

Final Exam Help!!!

Question 27 Multiple Choice 2 points
By what factor should the length of a simple pendulum be changed in order to triple the period of vibration?
3
6
9
27

Question 28 Multiple Choice 2 points

Each compression in the waveform of the longitudinal wave shown above corresponds to what feature of the transverse wave below it?
wavelength
crests
troughs
amplitude

Question 29 Multiple Choice 2 points
Each stretched region in the waveform of the longitudinal wave shown above corresponds to what feature of the transverse wave below it?
wavelength
crests
troughs
amplitude

Question 30 Multiple Choice 2 points
Which of the following most affects the wavelength of a mechanical wave moving through a medium? Assume that the frequency of the wave remains constant.
the nature of the medium
the amplitude
the height of a crest
the energy carried by the wave

Question 31 Multiple Choice 2 points
Suppose that two sound waves passing through the same medium have different wavelengths. Which of the following is most likely to be the reason for the differing wavelengths?
the nature of the medium
differences in amplitude
differences in frequency
the type of wave

Question 32 Multiple Choice 2 points
When two mechanical waves coincide, the amplitude of the resultant wave is always ____ the amplitudes of each wave alone.
greater than
less than
the sum of
the same as

Question 33 Multiple Choice 2 points
Sound waves
are a part of the electromagnetic spectrum.
do not require a medium for transmission.
are longitudinal waves.
are transverse waves.

Question 34 Multiple Choice 2 points
Which of the following is the region of a sound wave in which the density and pressure are greater than normal?
rarefaction
compression
amplitude
wavelength

Question 35 Multiple Choice 2 points
Of the following materials, sound waves travel fastest through
helium at 0°C.
air at 0°C.
copper at 0°C.
air at 100°C.

Question 36 Multiple Choice 2 points
In general, sound travels faster through
solids than through gases.
gases than through solids.
gases than through liquids.
empty space than through matter.

Question 37 Multiple Choice 2 points
A train moves down the track toward an observer. The sound from the train, as heard by the observer, is ____ the sound heard by a passenger on the train.
the same as
a different timbre than
higher in pitch than
lower in pitch than

Question 38 Multiple Choice 2 points
The Doppler effect occurs with
only sound waves.
only transverse waves.
only water waves.
all waves.

Question 39 Multiple Choice 2 points
At a distance of 3 m, the intensity of a sound will be ____ the intensity it was at a distance of 1 m.
one-ninth
one-third
3 times
9 times

Question 40 Multiple Choice 2 points
The intensity of a sound at any distance from the source is directly proportional to the sound's
wavelength.
pitch.
power.
frequency.

Question 41 Multiple Choice 2 points
When the frequency of a force applied to a system matches the natural frequency of vibration of the system, ____ occurs.
damped vibration
random vibration
timbre
resonance

Question 42 Multiple Choice 2 points
The Tacoma Narrows bridge collapsed in 1940 when winds caused ____ to build up in the bridge.
a compression wave
a longitudinal wave
a standing wave
friction

Question 43 Multiple Choice 2 points
If a guitar string has a fundamental frequency of 500 Hz, what is the frequency of its second harmonic?
250 Hz
750 Hz
1000 Hz
2000 Hz

Question 44 Multiple Choice 2 points
Four beats per second are heard when two notes are sounded. The frequency of one note is 420 Hz. Which of the following is a possible frequency of the other note?
418 Hz
105 Hz
416 Hz
1680 Hz

Question 45 Essay 4 points
A 0.10 kg piece of copper at an initial temperature of 95°C is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The water and calorimeter are initially at 15°C. What is the final temperature of the system when it reaches equilibrium?

Last edited: Jul 21, 2006
2. Jul 21, 2006

### Math Is Hard

Staff Emeritus
er... you posted a link to Blackboard at the bottom. Are you in the middle of taking your final exam for a distance learning course?

3. Jul 21, 2006

### alwysnforevr002

No sorry that was a link i had copied so it went straight to my page when i pasted the rest of the information

4. Jul 21, 2006

### Moonbear

Staff Emeritus
We do not give "help" in the form of answers to your final exams. Those you have to do on your own.