DELAYED SWEEP - In this mode the time sweep is made after a certain delay time
determined by the delay setting dial.
EXTERNAL X - When in this position, the time base generator is disconnected allowing
the horizontal deflection of
Describe any analysis (calculations of averages, graphs, fits, etc.) done to obtain
your final results for parameters measured and/or hypotheses tested (e.g., de Broglie).
Discuss in detail your calculations of statistical and systematic er
it. Please keep in mind the schedule it is your responsibility to complete the experiments
3. Preparation for each Experiment:
The key to this course is to read and study the write-up (including reference material)
before coming to
You can qualitatively demonstrate the vector effects of an electric and magnetic field on
a charged particle with the e/m apparatus as predicted by the Lorentz force law.
With the electron beam on and th
blue line, and it also makes the violet line appear more blue. You can see the actual colors
of the light if you hold a piece of white non-fluorescent material in front of the mask. The
palm of your hand works in a pinch, although it fl
Excitation and Ionization Energies of
The essence of this experiment is the demonstration of energy quantization of atoms, Ne
in this case. This is achieved via inelastic e scattering off Ne atoms. As such it is closely
Figure 7.1: ESR diagram (left), scope display (right)
of only two ways (space quantization), spin up or spin down, with energies equal to
E0 gs B B/2; where E0 is the energy of the electron before the magnetic field was applied.
In the la
Basic ESR Setup
In addition to the Probe Unit, the ESR Adapter, and the Helmholtz coils, you will need the
following additional equipment: Frequency Meter, DC Power Supply (10V, 3-4A), Power
Fig. 2.1 shows the apparatus. The e/m tube is filled with helium at a pressure of
102 mm Hg. Connect a regulated 6-9 Vdc supply rated at 2 A to the Helmholtz coil
jacks. Be sure to observe the color-coded polarity on
accepted and correctly displayed by the oscilloscope without distortion. This is especially
important for signals from detectors such as photomultipliers which can emit pulses of
nanosecond risetime. Because of the finite bandwidth of the a
Figure 1.2: setting a coincidence
4) Check the horizontal and vertical scales. Are they about the right order of magnitude
for the signal you are observing?
5) Check that the input is not on OFF or GND.
6) Are you sure of your i
Figure 3.3: Circuit Diagram
Data Taking and Analysis
The tube is old and rings are faint, so do the best you can. Be sure the room is very dark.
The rings are quite distinct at the full 5 kV, but get very hard to see as you go
Figure 7.6: Scope displays
midrange value. Then insert the test sample into the RF probe and place the probe and
sample in the center of the Helmholtz coils, with the Helmholtz coil axis perpendicular
to the sample. The oscilloscope trace
an exact parallel position with the plane of the coils.
Three data variables are necessary to make a determination of the ratio e/m. They are
the accelerating voltage, the coil current, and the radius of the beam curvature
5. List of Experiments:
The following 10 experiments are to be done this semester1
e/m Ratio for Electrons (dark)
Electron Diffraction (very dark, and works marginally)
Balmer Series (dark)
Plancks Constant (dark)
a slightly different form was good guess work by Balmer, it remained for both Rydberg
and Ritz to suggest independently in the 1890s that equation 4.1 might be modified to
, m = 1, 2, 3, . n = 2, 3, 4, . n > m
This simple experiment will help you gain familiarity with the second most important
statistical distribution in physics, the Poisson distribution. It describes the results of
experiments where one counts events
Electrons as waves.
Study and verification of the de Broglie hypothesis = h/p.
Measurement of the spacing of diffracting planes in graphite.
In a bold and daring hypothesis in his 1924 doctora
applying a reverse potential V between the anode and cathode, the photoelectric current
can be stopped. KEmax can be determined by measuring the minimum reverse potential
needed to stop the photoelectrons and reduce the photoelectric cu
1. Purpose of this Course:
Physics is science, hence based on experiment. The majority of research physicists do
experiments and make measurements. This course is meant as an introduction to modern
In this course yo
The emission and absorption of light was an early subject for investigation by the German physicist Max Planck. As he attempted to formulate a theory to explain the spectral
distribution of emitted light base
int main ( void );
double cpu_time ( void );
void daxpy ( int n, double da, double dx, int incx, double dy, int incy );
double ddot ( int n, double dx, int incx, double d
Bingkun Yang HW6
1. Comparing the tradeoff the snooping cache coherency protocol and the
directory-based cache coherency protocol:
The snooping cache coherency protocol tends to have a faster speed. But to
Bingkun Yang HW6
1. We should use the SSD other than the magnetic hard drive.
The advantages of SSD over HDD:
a. The SSD has access speed of 35 to 100 microseconds, while the traditional
hard drive need
9/ l7/20l5 Gustafson's law - Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia
Gustafson's Law (also known as GustafsonBarsis'
lawm) is a law in computer science which says that
computations involving arbit