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Resonance fluorescence is demonstrated by illuminating a
sodium vapour with white visible light. The emitted light is
spectrally analyzed and shows the emission spectrum of sodium.
Therefore the same atomic levels are involved in both
absorption and emission.
Charged oil droplets subjected to an electric field and to gravity between the plates of a capacitor are accelerated by application of a voltage. The elementary charge is determined from the velocities in the direction of gravity and in the opposite direction.
Electrons are accelerated in an electric field and enter a
magnetic field at right angles to the direction of motion. The
specific charge of the electron is determined from the accelerating
voltage, the magnetic field strength and the radius of the ...
Electrons are accelerated in a tube filled with mercury vapour.
The excitation energy of mercury is determined from the distance
between the equidistant minima of the electron current in a
variable opposing electric field.
Electrons are accelerated in a tube filled with neon vapour. The
excitation energy of neon is determined from the distance between
the equidistant minima of the electron current in a variable
opposing electric field.
A photocell is illuminated with monochromatic light of different
wavelengths from a filament lamp with interference filters. The
maximum energy of the ejected electrons in the photo-cell
depends only on the frequency of the incident light, and is
independent of its ...
The photoelectric effect is one key experiment in the development of modern physics. White light from a filament lamp is filtered by a grating spectrometer and illuminates a photocell. The maximum energy of the ejected electrons depends only on the frequency of the incident light, and ...
The "Zeeman effect" is the splitting up of the spectral lines of
atoms within a magnetic field. The simplest is the splitting up of
one spectral line into three components called the "normal Zeeman
effect". In this experiment the normal Zeeman effect as well as the
A beam of potassium atoms generated in a hot furnace travels along a specific path in a magnetic two-wire field. Because of the magnetic moment of the potassium atoms, the non-homogeneity of the field applies a force at right angles to the direction of their motion. The potassium atoms ...
A beam of potassium atoms generated in a hot furnace travels
along a specific path in a magnetic two-wire field. Because of the
magnetic moment of the potassium atoms, the nonhomogenity of the
field applies a force at right angles to the direction of their
motion. The potassium ...
With electron spin resonance (ESR) spectroscopy compounds having
unpaired electrons can be studied. The physical background of ESR
is similar to that of nuclear magnetic resonance (NMR), but with
this technique electron spins are excited instead of spins of
atomic nuclei. The ...
Model experiment for electron spin resonance for clear
demonstration of interaction between the magnetic moment of the
electron spin with a superimposed direct or alternating magnetic
What you can learn about
Fast electrons are diffracted from a polycrystalline layer of
graphite: interference rings appear on a fluorescent screen. The
interplanar spacing in graphite is determined from the diameter of
the rings and the accelerating voltage.
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