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Muzamil ShahQuestions Answer
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Muzamil ShahQuestion 1 options:
Reread the section on error propagation in the lab manual.
You want to determine the energy stored in a capacitor for a given voltage. You measure the capacitance C
and the applied voltage V and calculate the energy from U = 0.5CV2. Which of the quantities, C or V, should
you measure most carefully (with the smallest relative uncertainty) to obtain the most reliable value (smallest
relative uncertainty) for U?
V because it is squared in the equation.
V because its value is usually larger than the value of C.
You should measure C and V equally carefully because both enter the equation for U.
C because you cannot trust the printed value of a capacitance
Question 2 options:
A stretched string is supported by two bridges a distance L apart. You are driving the string with an inductive
coil and find the lowest resonance frequency at 100 Hz. Now you move the bridges a little so that the
distance between them is 10% larger than before. The new resonant frequency
is larger than it was before.
may be larger or smaller; one needs more information to decide.
is smaller than it was before.
is the same as it was before.
Question 3 options:
You managed to create charged tapes with unequal charges. Tape A carries a positive charge QA = +Q and
tape B carries a negative charge that is five times as large, QB = -5Q. You measure the Coulomb forces of
the tapes on each other and find
The Coulomb force on B due to A is five times as large as the Coulomb force on A due to B.
The Coulomb force on A due to B is five times as large as the Coulomb force on B due to A.
The Coulomb force on A due to B is larger, but not five times as large, as the Coulomb force on B due to A.
The Coulomb force on A due to B is as large as the Coulomb force on B due to A.
Question 4 options:
You have done experiments on water waves and on light waves. Destructive interference occurs when the
path difference is
half a wavelength for light waves and a full wavelength for water waves.
half a wavelength for water waves and a full wavelength for light waves.
half a wavelength for both light waves and water waves.
a full wavelength for both light waves and water waves.
Question 5 options:
Which of the experiments did you like best? Please check your favorite (all answers receive full credit)
1)
The Oscilloscope
2)
Vibrating Strings
3)
Resonance Frequencies of a Tube
4)
Electrostatic Interactions
5)
Electric Potential and Electric Fields
6)
Resistance
7)
RC Circuits
8)
Magnetic Effects
9)
Mirrors and Lenses
10)
Interference and Diffraction I
11)
Interference and Diffraction II
Question 6 options:
Which of the experiments did you like the least? Please check your least favorite (all answers receive full
credit)
1)
The Oscilloscope
2)
Vibrating Strings
3)
Resonance Frequencies of a Tube.
4)
Electrostatic Interactions
5)
Electric Potential and Electric Fields
6)
Resistance
7)
RC Circuits
8)
Magnetic Effects
9)
Mirrors and Lenses
10)
Interference and Diffraction I
11)
Interference and Diffraction II
Question 7 :
We are making changes to the lab and would like your input. Why did you like/dislike the experiment you
selected in Question 5/6 ?
Answer:
I like the vibrating string experiment as it is easy to understand and at resonant frequency standing waves
formed which is an excitement when I observed and it almost tell us the theoretical resonant frequency. The
other experiment I most dislike is no 9. Because in this I have to focus the light on the mirror, and made the
alignment and find out the focal point etc. I am getting bored in such like experiment and it give me no
excitement.